atomic unit of length

{
  "id": "NISTu249",
  "unitsml_id": "u:atomic_unit_of_length",
  "name": "atomic unit of length",
  "names": [
    {
      "value": "atomic unit of length",
      "lang": "en"
    }
  ],
  "symbols": {
    "unicode": "𝑎₀",
    "ascii": "a_0",
    "html": "<i>a</i><sub>0</sub>",
    "latex": "\\ensuremath{\\mathit{a}_\\mathrm{0}}",
    "id": "a_0",
    "mathml": "<msub><mi mathvariant='italic'>a</mi><mn>0</mn></msub>"
  },
  "identifiers": [
    {
      "type": "nist",
      "id": "NISTu249"
    },
    {
      "type": "unitsml",
      "id": "u:atomic_unit_of_length"
    }
  ],
  "references": [],
  "short": "atomic_unit_of_length",
  "root": true,
  "composite": false,
  "quantities": [
    {
      "id": "NISTq1",
      "name": "length",
      "type": "base"
    }
  ],
  "dimension": {
    "id": "NISTd1",
    "name": "length",
    "expression": "L",
    "components": [
      {
        "key": "length",
        "symbol": "L",
        "power": 1
      }
    ],
    "dimensionless": false
  },
  "scale": {
    "id": "continuous_ratio",
    "name": "continuous ratio scale"
  },
  "systems": [
    {
      "id": "non-SI_not_acceptable",
      "name": "non-SI and not acceptable",
      "short": "nonsi-unacceptable",
      "acceptable": false
    }
  ],
  "root_units": null
}