{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.two","code":"thing-two","url":"https://ver.cy/models/thing/two/","name":"two","alternateNames":["2","II","deuce","craps","snake eyes","couple","pair","twosome","twain","brace","span","yoke"],"kind":"thing","status":"published","version":"0.2.0-wave.2","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":"The natural number following one and preceding three, the smallest and only even prime, represented by the numeral 2 and the Roman numeral II, and appearing in language and culture as a pair or couple, in dice as the roll called snake eyes, in cards and games as deuce, and in mathematics as the base of binary arithmetic and the foundation of concepts of duality, parity and pairing; two is fundamental in counting, logic and symbolism.","purpose":"Let an agent explain the number two and its mathematical properties, describe its representations and cultural uses, support arithmetic and binary questions, and describe its symbolism across cultures with attribution.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Even prime","Binary base","Pairing and duality","Cultural symbolism"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What two is.","layers":[{"id":"properties","name":"Properties","description":"Mathematical properties.","findings":[{"id":"properties-finding","name":"Properties","description":"Properties.","questions":[{"text":"What mathematical properties does two have, including primality, parity and its role in powers and roots?","kind":"definition"},{"text":"Which entry fits prime numbers?","kind":"action"}]}]},{"id":"binary","name":"Binary","description":"Binary and computing.","findings":[{"id":"binary-finding","name":"Binary","description":"Binary.","questions":[{"text":"How does two serve as the base of binary arithmetic and digital computing?","kind":"definition"},{"text":"Which entry fits binary numbers?","kind":"action"}]}]}]},{"id":"represent","name":"Represent","description":"Representations and uses.","layers":[{"id":"numerals","name":"Numerals","description":"Numerals and words.","findings":[{"id":"numerals-finding","name":"Numerals","description":"Numerals.","questions":[{"text":"How is two written in numeral systems and named across languages?","kind":"provenance"},{"text":"Which entry fits numeral systems?","kind":"action"}]}]},{"id":"games","name":"Games","description":"Two in games.","findings":[{"id":"games-finding","name":"Games","description":"Games.","questions":[{"text":"What do deuce, snake eyes and other game terms for two mean?","kind":"definition"},{"text":"Which entry fits a specific game?","kind":"action"}]}]}]},{"id":"culture","name":"Culture","description":"Symbolism and language.","layers":[{"id":"symbolism","name":"Symbolism","description":"Symbolism.","findings":[{"id":"symbolism-finding","name":"Symbolism","description":"Symbolism.","questions":[{"text":"How is two symbolised in cultures and religions, in their own terms, from duality to pairing?","kind":"provenance"},{"text":"Is the presentation attributed?","kind":"boundary"}]}]},{"id":"language","name":"Language","description":"Pairs and couples.","findings":[{"id":"language-finding","name":"Language","description":"Language.","questions":[{"text":"How do languages express two through pairs, couples and dual number forms?","kind":"provenance"},{"text":"Which entry fits grammatical number?","kind":"action"}]}]}]},{"id":"learn","name":"Learn","description":"History and teaching.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How did the concept and numeral for two develop in early mathematics?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How is two taught in early numeracy?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Use the number two correctly in counting, arithmetic and as the base of binary.","Explain its properties, such as being the only even prime.","Describe cultural meanings of two with their sources."],"mustNot":["Confuse the numeral 2 with similar characters in identifiers or data.","Present numerological or superstitious claims about two as fact.","Mock cultural associations of two in a way that offends a community.","Use pairs or duals to force people into binary categories they do not accept."],"requiresHuman":["Relying on a count of two people, such as two-person rules, for safety or security decisions."]},"ethics":{"considerations":["Binary framings can exclude people who do not fit two categories.","Numbers carry luck and taboo in cultures; mocking them can offend."],"affectedParties":["Students","Cultural communities","People outside binary categories"]},"owners":{"steward":"Nobody: a number held in common.","roles":[],"masterSystems":[]},"relations":[{"target":"oewn-13763162-n","type":"parent","note":"registry parent class"},{"target":"natural number","type":"related","note":"category"},{"target":"cardinal","type":"related","note":"cardinal numbers"},{"target":"ordinal number","type":"related","note":"second as the ordinal"},{"target":"point","type":"related","note":"a score of two points"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.two","Open English WordNet: oewn-13765409-n"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Sum of one and one","Only even prime","One is the unit; three follows","Not physical; the numeral 2."]},"capabilities":{"applicability":"required","items":["explain mathematical properties","describe representations and uses","support arithmetic and binary questions","describe symbolism"]},"hazards":{"applicability":"required","items":["Confusing numeral systems","Overinterpreting symbolism","Binary and decimal confusion"]},"interfaces":{"applicability":"required","items":["Numeral conventions","No regulation"]},"context":{"applicability":"required","items":["The number two.","two as a natural number","two in binary and computing","two in games such as dice and cards","pairs and couples in language","two in symbolism and religion"]}},"sources":[{"title":"Open English WordNet 2024, synset oewn-13765409-n","url":"https://en-word.net/id/oewn-13765409-n","note":"sense and gloss of the concept"},{"title":"Wiktionary: two","url":"https://en.wiktionary.org/wiki/two","note":"word senses and usage"}],"openQuestions":["Should binary be a separate entry?","How should number theory resources be linked?","How should cultural symbolism be attributed?"],"resources":{"spec":"/models/things/publications/thing-two/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-two/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T04:14:57Z","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 2026-10-07T12:16:35+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}}