{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.digit","code":"thing-digit","url":"https://ver.cy/models/thing/digit/","name":"digit","alternateNames":["figure","binary digit","octal digit","decimal digit","duodecimal digit","hexadecimal digit","significant digit","significant figure","zero","0","nought","cipher"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"noun.quantity","plane":"XCT","domain":["XCT.QTY"],"industry":[],"navPath":"","tags":[],"facets":{"substance":"abstract","origin":"conceptual","agency":"inert","mobility":"not-applicable","scale":"not-applicable","affordances":["observable"]}},"whatItIs":"One of the symbols that collectively form a system of numeration, such as 0-9 in decimal, 0-1 in binary or 0-9 and A-F in hexadecimal; also called a figure.","purpose":"Let an agent handle digits by base, symbol, place value and use in codes and check digits.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Element of a numeral system","Number of digits equals the base","Place value determines meaning","Different scripts have different digit shapes"],"structure":{"bundles":[{"id":"system","name":"System","description":"Which base.","layers":[{"id":"base","name":"Base","description":"Radix.","findings":[{"id":"base-finding","name":"Base","description":"Base.","questions":[{"text":"In which base is the digit used?","kind":"definition"},{"text":"Which symbols are valid?","kind":"definition"}]}]},{"id":"script","name":"Script","description":"Writing system.","findings":[{"id":"script-finding","name":"Script","description":"Script.","questions":[{"text":"Which script are the digits written in?","kind":"definition"},{"text":"How do they map to ASCII digits?","kind":"action"}]}]}]},{"id":"value","name":"Value","description":"Place value.","layers":[{"id":"place","name":"Place","description":"Position.","findings":[{"id":"place-finding","name":"Place","description":"Place value.","questions":[{"text":"What value does the digit have in this position?","kind":"measurement"},{"text":"How is the number converted?","kind":"action"}]}]},{"id":"conversion","name":"Conversion","description":"Between bases.","findings":[{"id":"conversion-finding","name":"Conversion","description":"Base conversion.","questions":[{"text":"What is this number in another base?","kind":"measurement"},{"text":"Is the conversion exact?","kind":"boundary"}]}]}]},{"id":"codes","name":"Codes","description":"Check digits.","layers":[{"id":"check","name":"Check digits","description":"Validation.","findings":[{"id":"check-finding","name":"Check","description":"Check digits.","questions":[{"text":"Which check digit algorithm applies?","kind":"definition"},{"text":"Is the code valid?","kind":"boundary"}]}]},{"id":"data","name":"Data","description":"Storage.","findings":[{"id":"data-finding","name":"Data","description":"Data handling.","questions":[{"text":"Should the value be stored as text to keep leading zeros?","kind":"boundary"},{"text":"Is the digit count fixed?","kind":"definition"}]}]}]},{"id":"senses","name":"Senses","description":"Disambiguation.","layers":[{"id":"anatomy","name":"Anatomy","description":"Fingers and toes.","findings":[{"id":"anatomy-finding","name":"Anatomy","description":"Anatomical sense.","questions":[{"text":"Is a finger or toe meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]},{"id":"teaching","name":"Teaching","description":"Learning.","findings":[{"id":"teaching-finding","name":"Teaching","description":"Teaching.","questions":[{"text":"How can place value be taught?","kind":"action"},{"text":"What misconceptions are common?","kind":"boundary"}]}]}]}]},"agentConduct":{"may":["Read, write and convert digits between numeral systems.","Check digits in identifiers using their check digit rules."],"mustNot":["Change digits in records such as accounts or identity numbers without authority.","Misread a digit in safety-critical values such as doses without flagging uncertainty.","Generate valid-looking identifiers to impersonate real ones."],"requiresHuman":["Correcting digits in official or financial records."]},"ethics":{"considerations":["A single wrong digit can misroute money, medicine or people.","Numbers that identify people are personal data."],"affectedParties":["People identified by numbers","Patients","Account holders"]},"owners":{"steward":"Nobody owns the concept; the issuer of each numbered record answers for it.","roles":[],"masterSystems":[]},"relations":[{"target":"oewn-13750609-n","type":"parent","note":"registry parent class"},{"target":"numeral system","type":"related","note":"system"},{"target":"number","type":"related","note":"representation"},{"target":"digit (finger or toe)","type":"related","note":"anatomical sense"},{"target":"check digit","type":"related","note":"validation"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.digit","Open English WordNet: oewn-13763162-n","Unicode digit characters: category Nd decimal digits in scripts"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Symbols 0-9 in decimal","Binary, octal and hexadecimal digits","Fingers and toes (anatomical digits) are another sense","Numeral symbols in text and displays."]},"capabilities":{"applicability":"required","items":["convert between bases","compute digit sums and check digits","read place values","handle digits in data validation"]},"hazards":{"applicability":"required","items":["Base confusion","Script digits not parsed by software","Leading zero loss in data"]},"interfaces":{"applicability":"required","items":["Unicode Standard","ISO 7064 check digit systems"]},"context":{"applicability":"required","items":["Writing numbers in positional numeral systems.","decimal digits","binary digits (bits)","octal digits","hexadecimal digits","digits in other scripts"]}},"sources":[{"title":"Open English WordNet 2024, synset oewn-13763162-n","url":"https://en-word.net/id/oewn-13763162-n","note":"sense and gloss of the concept"},{"title":"Wiktionary: digit","url":"https://en.wiktionary.org/wiki/digit","note":"word senses and usage"}],"openQuestions":["Should digit sets per base be separate entries?","How should script digits be linked?","How should the anatomical sense be split off?"],"resources":{"spec":"/models/things/publications/thing-digit/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-digit/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T07:40:02Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:16:27+00:00: completeness 1.00; sense: WordNet gloss; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}