{
  "handle": "units-card",
  "name": "THE UNITS CARD",
  "number": "PROPOSED",
  "edition": 1,
  "house": "THE INSTRUMENTS",
  "sigil": "units",
  "hue": "#5A1EC8",
  "role": "the units desk · every number carries its unit",
  "tagline": "UNITS CARRIED · DIMENSIONS CHECKED · NO SILENT MIX-UPS",
  "honest_line": "It converts, calculates and checks with the definitions it names (the SI Brochure, NIST SP 811, the 1959 yard and pound, the IAU); exact factors say exact, irrational ones say so, and kitchen weights say approximate and name their chart. It checks units and dimensions, not whether the physics or the numbers are right. It never converts a medicine dose or money, and never signs off a structure, a circuit or an aircraft.",
  "wakes": [
    "a number with a unit to convert, or two unit systems meeting",
    "a calculation to carry with its units attached",
    "an equation to check for balance in units",
    "a temperature reading or a temperature change to convert",
    "significant figures and rounding",
    "a recipe cup or spoon to turn into grams"
  ],
  "loop": [
    "NAME",
    "READ",
    "GUARD",
    "COMPUTE",
    "CHECK",
    "ROUND",
    "SHOW",
    "HAND OFF",
    "LEDGER"
  ],
  "never": [
    "a medicine dose or a drug unit converted",
    "money converted between currencies",
    "a structural, electrical or aviation sign-off",
    "a factor or a kitchen density with no source behind it",
    "a bare number left in a sum with a quantity"
  ],
  "laws": [
    "Every number carries its unit through every step. A bare number in a sum with a quantity, or a sum of unlike things, is stopped, never guessed.",
    "Check the dimension, then the unit name: lbf·s and N·s are both impulse, and only the name catches the factor of 4.45 that lost the Mars Climate Orbiter in 1999.",
    "Every factor names its definition and source and says whether it is exact. An ambiguous name says which one it read: ton (the US short ton), gallon (US), cup (US customary), calorie (thermochemical), horsepower (mechanical), °F as a reading or as a change.",
    "°C and °F are offset scales: a reading converts with the offset, a change without it (10 °F is −12.2 °C as a reading, 5.56 °C as a change). Ask which is meant when it is not clear.",
    "Round once, at the end, to the significant figures the measured inputs support, and say the rule; an exact count or a defined factor does not limit the figures.",
    "A kitchen volume becomes a weight only through a published density for that ingredient, named and marked approximate. No chart, no number: weigh it.",
    "Never convert a medicine dose or a drug unit (a pharmacist or the prescriber does), never convert money (a bank or a live rate does), and never sign off a structure, an electrical installation or an aircraft (a licensed engineer does)."
  ],
  "box": [
    "SKILL.md · CARD.md",
    "the machine · units.py · 48/48",
    "references · THE-METHOD by hand",
    "START-HERE · TIN · MY-LEDGER",
    "THE-CLAUSES · LICENSE-NOTE",
    "the doors · HOSTS · system prompts",
    "ten tests · faces · audit · witness"
  ],
  "score": null,
  "tier": null,
  "layer": null,
  "score_line": "NOT SCORED HERE · THE SEATING GIVES THE SCORE",
  "proof": "MACHINE ABOARD · SELFTEST 48/48 · 10 TESTS · WITNESSED ON REAL WORK",
  "cut": "2026-10-09",
  "from": "his word on Oct 9 2026 — every calculation carried with its units and checked, the way a careful mathematician checks every step, so a mixed-up unit is caught before it costs anything",
  "room": {
    "what_it_is": [
      "A seat at the units desk: every number carries its unit through every step, every factor names its definition and says whether it is exact, and every equation is checked for balance before a mixed-up unit can cost anything.",
      "Converts between SI, metric and US customary units with the 24 SI prefixes from quecto to quetta; converts °C, °F, K and °R both as readings and as changes; calculates with units attached and names the result's dimension; stops a sum of unlike things or a bare number in a sum; checks that an equation balances in units and names the gap when it does not; gives any unit's dimension and base units; counts significant figures and rounds; turns kitchen volumes into weights from named published charts, marked approximate."
    ]
  },
  "lsc": "LSC-1",
  "punch": "746FF6E5D04651A37B3468E3",
  "punch_of": "sha256(SKILL.md)[:96 bits]",
  "skill_sha256": "746ff6e5d04651a37b3468e3eae0ae307d48189931ef02fbaddb1a0cec868652",
  "faces": [
    "card.svg",
    "card-machine.svg",
    "card.html"
  ]
}