natural unit of time

{
  "id": "NISTu245",
  "unitsml_id": "u:natural_unit_of_time",
  "name": "natural unit of time",
  "names": [
    {
      "value": "natural unit of time",
      "lang": "en"
    }
  ],
  "symbols": {
    "unicode": "ℏ/𝑚ₑ𝑐²",
    "ascii": "h-bar*(m_e*c^2)",
    "html": "<i>&#295;</i>/<i>m</i><sub>e</sub><i>c</i><sup>2</sup>",
    "latex": "\\ensuremath{\\mathit{\\hbar}/(\\mathit{m}_\\mathrm{e}\\mathit{c}^\\mathrm{2}})",
    "id": "h-bar*(m_e*c^2)",
    "mathml": "<mrow><mi mathvariant='italic'>&#295;</mi><mo>/</mo><msup><mi mathvariant='italic'>m</mi><mi mathvariant='normal'>e</mi></msup><msup><mi mathvariant='italic'>c</mi><mn>2</mn></msup></mrow>"
  },
  "identifiers": [
    {
      "type": "nist",
      "id": "NISTu245"
    },
    {
      "type": "unitsml",
      "id": "u:natural_unit_of_time"
    }
  ],
  "references": [],
  "short": "natural_unit_of_time",
  "root": true,
  "composite": false,
  "quantities": [
    {
      "id": "NISTq3",
      "name": "time",
      "type": "base"
    }
  ],
  "dimension": {
    "id": "NISTd3",
    "name": "time",
    "expression": "T",
    "components": [
      {
        "key": "time",
        "symbol": "T",
        "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
}