{
  "url": "https://openlegislation.uk/eu-directive-1980-181/annex/chapter-I/division-1/division-1.3",
  "json_url": "https://openlegislation.uk/eu-directive-1980-181/annex/chapter-I/division-1/division-1.3.json",
  "legislation": "eudr/1980/181",
  "legislation_title": "Council Directive of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (80/181/EEC)",
  "legislation_url": "https://openlegislation.uk/eu-directive-1980-181",
  "path": "annex/chapter/I/division/1/division/1.3",
  "kind": "division",
  "number": "1.3",
  "heading": "Prefixes and their symbols used to designate certain decimal multiples and submultiples",
  "text": "Factor\nPrefix\nSymbol\n10 24\nyotta\nY\n10 21\nzetta\nZ\n10 18\nexa\nE\n10 15\npeta\nP\n10 12\ntera\nT\n10 9\ngiga\nG\n10 6\nmega\nM\n10 3\nkilo\nk\n10 2\nhecto\nh\n10 1\ndeca\nda\n10 -1\ndeci\nd\n10 -2\ncenti\nc\n10 -3\nmilli\nm\n10 -6\nmicro\nμ\n10 -9\nnano\nn\n10 -12\npico\np\n10 -15\nfemto\nf\n10 -18\natto\na\n10 -21\nzepto\nz\n10 -24\nyocto\ny\nThe names and symbols of the decimal multiples and submultiples of the unit of mass are formed by attaching prefixes to the word ‘ gram ’ and their symbols to the symbol ‘ g ’ .\nWhere a derived unit is expressed as a fraction, its decimal multiples and submultiples may be designated by attaching a prefix to units in the numerator or the denominator, or in both these parts.\nCompound prefixes, that is to say prefixes formed by the juxtaposition of several of the above prefixes, may not be used.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Directive 1999/103/EC of the European Parliament and of the Council of 24 January 2000 amending Council Directive 80/181/EEC on the approximation of the laws of the Member States relating to units of measurement."
    },
    {
      "type": "X",
      "label": "X1",
      "text": "Substituted by Corrigendum to Council Directive 80/181/EEC of 20 December 1979 on the aproximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (Official Journal of the European Communities No L 39 of 15 February 1980)."
    },
    {
      "type": "X",
      "label": "X2",
      "text": "Substituted by Corrigendum to Directive 1999/103/EC of the European Parliament and of the Council of 24 January 2000 amending Council Directive 80/181/EEC on the approximation of the laws of the Member States relating to units of measurement (Official Journal of the European Communities L 34 of 9 February 2000)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/1980/181/annex/chapter/I/division/1/division/1.3",
    "retrieved_at": "2026-11-01T15:23:40.868248+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}