shield
Enable an AI agent to recognise a physical shield, assess its suitability and condition for a stated protective task, and determine whether and how it may be positioned, used, maintained or withdrawn.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a physical shield, assess its suitability and condition for a stated protective task, and determine whether and how it may be positioned, used, maintained or withdrawn.
A portable defensive plate, gripped, strapped to the forearm, or held by handles rather than worn as a garment, whose function is to intercept, deflect, or absorb blows and projectiles before they reach the bearer.
It can be Identify the shield and retrieve evidence for its stated protective role; Compare documented protection and coverage with a proposed hazard scenario; Position, orient or secure the shield using its supported interfaces; Inspect the protective body, viewing features and load-bearing attachments; Clean, store or replace components within applicable instructions; Restrict, quarantine or retire the shield when its suitability is unresolved or compromised.
Distinguishing features
Check whether the object has an identified protective interception or attenuation role; a similar-shaped decorative panel does not establish that role.
Check whether protection depends on placing a distinct barrier between a hazard and a target; distinguish this from protection supplied primarily by clothing conforming to the body.
Check whether the shield can be identified as a protective component independently of its carrier; distinguish it from the entire vehicle, machine or enclosure.
Check whether grips, straps, mounts or an installation specification establish how its protective face is presented; shape alone is insufficient identification.
Check whether protection concerns a stated hazard and direction; a generic partition's separation function alone does not establish shield suitability.
Scope
+ Shield identity, intended protective role and evidence supporting that role
+ Protective body, edges, openings and layered construction
+ Coverage relative to hazard direction and the protected target
+ Grips, straps, mounts and constraints on positioning
+ Damage, exposure history, inspection and permitted continued use
- The protected person's anatomy, training and overall protective equipment
- Weapons, hazard generators and their operating procedures
- Whole vehicles, buildings or machines carrying a shield
- Protective clothing and body-conforming armour as complete systems
- Complete enclosures, perimeter walls and general access barriers
- Heraldic symbols, software shields and nonphysical protective fields
Characteristics
- Protective role
- Recorded hazard classes and intended protective task; unknown permitted A shield's suitability must be assessed against the actual hazard rather than its name or appearance.
- Protection evidence
- Links to applicable specifications, test reports, markings and use restrictions Separates documented protection from unsupported claims and identifies the conditions under which evidence applies.
- Protective dimensions
- Height, width and thickness in mm; curvature described with a stated method Constrains coverage, positioning and compatibility with the intended task.
- Mass
- kg, with installed accessories identified Affects support requirements, handling and the ability to maintain protective positioning.
- Construction
- Recorded materials, layer arrangement, edge construction and transparent sections; unknown permitted Supports identification and selection of appropriate inspection and maintenance guidance.
- Deployment interface
- Hand-held, arm-supported, freestanding, mounted, other or unresolved Determines how the shield is supported and what interfaces must remain serviceable.
- Target and hazard geometry
- Protected target, hazard direction, shield orientation, separation and remaining exposed regions Protection depends on placement and coverage, not merely possession of a shield.
- Protective-body condition
- Observed defects by location and extent, inspection date and assessment status Records damage without assuming that visual appearance proves retained protective performance.
- Use disposition
- Unassessed, permitted for a specified task, restricted, quarantined or retired Makes the permitted next action explicit and ties it to evidence and conditions.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.shield-artifact
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Protective role and evidence Establishes what the shield is intended to protect against and what supports that claim.
The label shield does not establish protection against any particular hazard.
Hazard and target
Identifies the protective task and its boundaries.
Intended interception
Record the hazard, protected target and intended protective effect without inferring capability from appearance.
- What hazard is this shield intended to intercept or attenuate, and what person, object or region is it intended to protect? definition
- Which hazard types or exposure conditions are explicitly excluded or remain unassessed? boundary
Claim applicability
Connects protective claims to the actual shield and its configuration.
Supported protection
Record the origin, applicability and limits of each protection claim separately from the claim itself.
- Which markings, manufacturer documents or test records support each claimed protection capability? provenance
- Do those records apply to this shield's identity, construction, accessories and present configuration? boundary
Protective body and coverage Describes the barrier and the spatial protection it can provide.
A suitable protective material does not establish that the target is covered or that every part of the shield provides equivalent protection.
Barrier construction
Records the shield's protective sections and discontinuities.
Protective sections
Identify body materials, layers, edges, joints and openings, preserving uncertainty about concealed construction.
- What materials and layer arrangement are documented for the body, rim and any transparent sections? provenance
- Where are openings, seams, attachment penetrations or sections whose protective capability differs or is unknown? boundary
Coverage geometry
Relates shield dimensions and placement to exposed target regions.
Effective covered region
Record coverage for a specified target, orientation and hazard direction rather than treating surface area as guaranteed protection.
- What are the shield's dimensions and curvature, and which target regions lie behind it in the proposed position? measurement
- Which changes in hazard direction, target posture or shield position create uncovered paths? boundary
Support, positioning and awareness Captures how the shield is carried or mounted and how its placement affects observation.
Protection may be lost when a shield cannot be held in position or prevents the user from perceiving the task environment.
Support and retention
Records the interfaces that carry and retain the shield.
Deployment interface
Identify grips, straps, stands or mounts and the conditions for secure support.
- Which grips, straps, stands or mounting points are intended to support this shield, and what compatibility requirements apply? definition
- What attachment checks or adjustments are required before the shield may be carried, mounted or repositioned? action
View and movement
Records visibility and movement constraints while maintaining coverage.
Usable protective position
Assess whether the supported position permits necessary observation and movement without assuming transparent or opaque designs are interchangeable.
- What can the user observe through or around the shield in its intended protective position, including any obscured regions? measurement
- Which required movements or equipment interactions would force the shield out of that position? boundary
Damage and retained protection Connects observed condition and exposure history to uncertainty about continued protective capability.
An intact-looking shield may lack evidence for continued use, while different defects require different assessments.
Damage observations
Records defects in protective and supporting components.
Located defects
Record cracks, deformation, separation, surface damage and attachment defects where applicable to the construction.
- What defects are present, where are they located, and what are their measured extent and effect on shape, visibility or attachment security? measurement
- Which documented inspection criteria determine whether each observed defect permits continued use or requires further assessment? provenance
Exposure and reassessment
Records events that may require evaluation even when visible damage is absent.
Protection reassessment triggers
Connect known or uncertain impact, environmental and modification history to applicable reassessment requirements.
- What impacts, heat, chemicals, weathering, repairs or modifications are recorded, and where is the history incomplete? provenance
- Under the applicable instructions, which events require inspection, testing, quarantine or retirement before further protective use? action
Use limits and care Makes permitted protective use and preservation actions explicit.
The agent must translate evidence and condition into a bounded use decision and avoid maintenance that invalidates protection claims.
Task-specific disposition
Records whether the shield may serve a particular protective task.
Permitted use decision
Associate the current disposition with a defined hazard scenario, configuration and supporting assessment.
- For which task, hazard conditions and configuration is this shield currently permitted, restricted or prohibited? boundary
- What unresolved evidence or condition issue must be addressed before an unassessed or quarantined shield can be used? action
Protection-preserving care
Captures care and component changes that preserve the basis for protective use.
Allowed care and changes
Record applicable cleaning, storage, repair and replacement instructions, including required post-change checks.
- Which cleaning agents, storage conditions and handling precautions are specified for this shield's protective materials and viewing surfaces? provenance
- Which components may be repaired or replaced, by whom, and what verification is required before protective use resumes? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- round shield (aspis, clipeus, targe)
- rectangular or curved body shield (scutum, tower)
- kite and heater shield
- buckler
- pavise
- riot or public-order shield
- ballistic shield
- hide or rawhide traditional shield (for example Nguni or Zulu)
- Which of these kinds and varieties hold for the sense of shield this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q131559 - Item 'shield'; English description 'item of armour carried to intercept attacks or projectiles'. Subclasses include riot shield Q829674 and scutum Q745446.
- Getty Art & Architecture Thesaurus (AAT) - 300036869 - Concept 'shields (armor)'.
- GND - 4179600-7 - Deutsche Nationalbibliothek subject heading for the object class.
- Library of Congress Subject Headings - sh85121403 - LCSH for shields as armour.
- BnF - 11978501z - Bibliothèque nationale de France authority.
- Portable Antiquities Scheme object type - SHIELD (id 95215) - UK finds recording type for archaeological shields; related type Shield+Boss (95241).
- Unicode - U+1F6E1 (🛡) - Emoji/symbol for the object class, not a product code.
- NIJ 0108.01 armour type - Type I | II-A | II | III-A | III | IV - Threat classification stamped or cited on U.S. ballistic shields; not a unique item identifier.
- Which of these identifiers and schemes hold for the sense of shield this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- NIJ Standard-0108.01 Ballistic Resistant Protective Materials (National Institute of Justice, USA, 1985) - de facto test cited for portable ballistic shields; covers materials used to make them, not a complete-product standard.
- NIJ Standard-0123.00 Specification for NIJ Ballistic Protection Levels and Associated Test Threats (National Institute of Justice, USA, 2023) - current HG/RF threat table other ballistic-equipment standards are meant to reference.
- ASTM International Committee E54 (Homeland Security Applications) - product-level ballistic-shield test work intended to replace coupon testing under 0108.01 for finished shields.
- NIJ Standard-0104.02 Riot Helmets and Face Shields (National Institute of Justice, USA, 1984) - governs helmet-mounted visors, not handheld riot shields; listed only so the two are not conflated.
- Which of these standards and regulation hold for the sense of shield this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Overlapping aspis or hoplon faces in a Greek phalanx, and overlapping scuta in a Roman testudo, as the unit's front and overhead cover.
- Medieval kite and heater shields carried on horseback and, from the 12th century, painted with the bearer's arms.
- Rapier-and-buckler civilian and fencing use from late medieval I.33 through the Renaissance.
- Scottish Highland targe used with broadsword into the 18th century.
- Police and gendarmerie public-order lines using transparent polycarbonate riot shields to stop thrown objects and blunt force, and as a short-range pushing tool.
- Police tactical and military entry teams carrying NIJ-rated ballistic shields (often with a viewport, weapon rest, lamp or camera) for warrant service, hostage rescue, and active-shooter approach.
- Zulu and other southern African cowhide shields in historical warfare and in later ceremonial or tourist display.
- Museum objects, HEMA and reenactment kit, and stage or film props.
- Which of these real-world use hold for the sense of shield this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- mass - 0.5-15 (buckler about 1; riot polycarbonate about 2-6; laminated wood body shield about 6-10; rifle-rated ballistic about 6-14) - kg
- height - 20-40 (buckler); about 90-120 (riot); about 100-120 (scutum/heater body shield); ballistic panels from about 50×70 to 60×120 - cm
- face thickness (non-ballistic) - 4-6 (polycarbonate riot); 5-6 (surviving laminated-wood scutum) - mm
- NIJ 0108.01 protection type - II or III-A in common handgun shields; III for rifle ball; IV for armour-piercing rifle (commercial 'III+' is not a defined type) - NIJ type
- Which of these typical measurements hold for the sense of shield this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Treating a riot shield as ballistic: polycarbonate public-order shields are not rated to stop bullets.
- Overmatch of a ballistic shield by a higher NIJ type, armour-piercing core, edge hit, or shot through the viewport.
- Behind-armour blunt trauma and multi-hit degradation even when the face is not perforated.
- Spall and ricochet from metallic faces toward the bearer or bystanders.
- Handle, strap, or viewport-frame failure that drops the plate or opens a gap.
- Bearer fatigue: a rifle-rated shield of 8-14 kg cannot be held in a firing posture for long, so cover is lost when it is lowered.
- Splintering or delamination of wood, hide, or aged laminate under heavy blows or moisture.
- UV, solvent, and scratch damage that clouds polycarbonate and hides incoming threats.
- Marketplace mismatch: quoting 0108.01 coupon tests, or mixing 0108.01 types with 0101 body-armour threats, as if they certified the finished shield.
- Offensive use in crowd control (shield-bashing) causing blunt injury independent of any protective rating.
- Which of these failure modes and hazards hold for the sense of shield this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Classical Mediterranean: Greek aspis/hoplon (deep round dish) versus Roman scutum (large oval, later rectangular semi-cylinder), later giving way again to oval clipeus.
- Medieval Latin Europe: kite then heater as the knightly form; buckler as the civilian and fencing form.
- Scotland: targe (studded leather over wood) named and used separately from the English buckler.
- Southern Africa: Nguni/Zulu cowhide shields as a distinct construction family (Wikidata Q28311132 for the Nguni type).
- Japan: tate (盾) as the native term and form-set, not a one-to-one match for European heater typology.
- Heraldic vocabulary: French écu / English escutcheon names the shield-shaped field in arms, not necessarily a fighting object; French bouclier is the physical plate.
- Modern policing: U.S. practice is dominated by NIJ-rated ballistic shields; much European public-order work is still a wall of non-ballistic polycarbonate.
- Which of these regional variation hold for the sense of shield this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- worn body armour (cuirass, vest, plate) - Armour is donned and stays on the torso; a shield is carried and can be discarded, stacked, or used to strike.
- helmet-mounted face shield or visor - Fixed to headgear and tested under riot-helmet standards such as NIJ 0104.02; a handheld shield is an independent plate with its own grip.
- riot shield versus ballistic shield - Riot shields are impact- and debris-rated polycarbonate or light metal with no ballistic type; ballistic shields carry an NIJ 0108.01 (or equivalent) type and are used when gunfire is the threat.
- pavise or mantlet - A pavise or mantlet is set on the ground or wheeled as a screen, especially for crossbowmen or siege work; a fighting shield is borne on the arm or in the hands while the user moves.
- gun shield or vehicle armour plate - Mounted on a weapon, turret, or hull and not independently carried by one person as personal cover.
- heraldic escutcheon - A graphic field in a coat of arms, often shield-shaped; identity is tested by whether a physical plate exists that can intercept a blow.
- buckler versus targe or small round - A buckler is a small fist-gripped duelling plate (typically under about 40 cm); a targe or small round is larger, often strapped to the forearm, and built as a war shield.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of shield this model covers, and on what evidence? provenance
Sources
- shield (Q131559) - Canonical item, English gloss as armour carried to intercept attacks or projectiles, and the AAT/GND/LCSH authority links used under identifiers.
- Category:Shields - Authority-file identifiers: Wikidata Q131559, GND 4179600-7, LCSH sh85121403, BnF 11978501z.
- The Evolution of Shields: From Ancient Soldiers to Riot Police - Historical kinds (aspis, scutum, buckler) and the modern return of handheld shields in military breaching and police public-order work.
- The Shield: Its Use and Development - Greek concave round shield and phalanx wall; Roman scutum size and role; medieval kite, heater, and buckler use including heraldic display.
- Scutum - Dura-Europos scutum dimensions (105.5 × 41 cm, 5-6 mm, about 6-7 kg) and the usual upper mass of about 10 kg.
- Body armor - Definition of a shield as held in the hand or arm; size range from full-body to small melee shields; modern ballistic-shield use in police and military entry work.
- Bouclier antiémeute - Riot-shield height about 90-120 cm, polycarbonate 4-6 mm, and the explicit split from ballistic shields.
- NIJ Standard-0108.01: Ballistic Resistant Protective Materials - U.S. performance standard whose scope includes portable ballistic shields and classifies protection by ammunition type (I through IV).
- NIJ Standard-0123.00: Specification for NIJ Ballistic Protection Levels and Associated Test Threats - Current NIJ handgun and rifle protection-level nomenclature (HG1/HG2, RF1-RF3) that other ballistic-equipment standards are meant to reference.
- Ballistic Shields Part 1: Basics and Tactics - Practice of rating complete shields to NIJ 0108.01; handgun versus rifle mass jump; UHMWPE construction of most IIIA/III shields.
- Police Shields Guide: Types, Materials & NIJ Protection Levels - Operational distinction: riot shields for blunt impact and debris only; ballistic shields independently tested, not interchangeable with riot shields in a firearms encounter.
- Raising the Standards for Protective Equipment Used by Public Order Police Officers / ballistic-shield product-standard discussion - That 0108.01 tests materials and coupons, not complete shields, and that ASTM E54 work aims to replace that mismatch for finished products.
What the second pass must settle
- Does the registry intend shield to cover both personal shields and equipment shields for heat, radiation or other hazards, or only a narrower physical-object class?
- What authoritative boundary separates a shield from a guard, screen, armour panel or protective enclosure in this registry?
- Does an existing Vercy world model already own this concept or any proposed part of its scope?
- Which protection standards, inspection criteria and retirement rules apply to each shield class eventually admitted to the model?
- How should ceremonial shields, replicas and historical examples be represented when protective intent exists but present protective capability is undocumented?