"sf" meaning in English

{
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      "expansion": "sf",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "science fiction",
          "word": "SF"
        }
      ],
      "categories": [],
      "examples": [
        {
          "ref": "2011 February 1, Istvan Csicsery-Ronay, Jr., The Seven Beauties of Science Fiction, Wesleyan University Press, pages 102–103",
          "text": "But some discussion of the complex relationship between “allohistory” and sf is appropriate here, as the genres overlap in certain ways. Classical allohistory— such as Trevelyan's \"What if Napoleon had won the Battle of Waterloo?\" and Churchill's \"If Lee had not won the Battle of Gettysburg\" —is a rigorously consistent thought-experiment in historical causality.",
          "type": "quotation"
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      ],
      "glosses": [
        "Alternative form of SF (science fiction)"
      ],
      "id": "en-sf-en-noun-z0IRBIZq",
      "links": [
        [
          "SF",
          "SF#English"
        ]
      ],
      "raw_glosses": [
        "(dated) Alternative form of SF (science fiction)"
      ],
      "tags": [
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    },
    {
      "alt_of": [
        {
          "word": "significant figure(s)"
        }
      ],
      "categories": [
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          "_dis": "41 59",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w+disamb"
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      "glosses": [
        "Abbreviation of significant figure(s)."
      ],
      "id": "en-sf-en-noun-3YkdlYr~",
      "links": [
        [
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      "tags": [
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  "word": "sf"
}

{
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  "head_templates": [
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      "expansion": "sf",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "science fiction",
          "word": "SF"
        }
      ],
      "categories": [
        "English dated terms",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2011 February 1, Istvan Csicsery-Ronay, Jr., The Seven Beauties of Science Fiction, Wesleyan University Press, pages 102–103",
          "text": "But some discussion of the complex relationship between “allohistory” and sf is appropriate here, as the genres overlap in certain ways. Classical allohistory— such as Trevelyan's \"What if Napoleon had won the Battle of Waterloo?\" and Churchill's \"If Lee had not won the Battle of Gettysburg\" —is a rigorously consistent thought-experiment in historical causality.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of SF (science fiction)"
      ],
      "links": [
        [
          "SF",
          "SF#English"
        ]
      ],
      "raw_glosses": [
        "(dated) Alternative form of SF (science fiction)"
      ],
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    {
      "alt_of": [
        {
          "word": "significant figure(s)"
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      "categories": [
        "English abbreviations"
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      "glosses": [
        "Abbreviation of significant figure(s)."
      ],
      "links": [
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  "word": "sf"
}

{
  "called_from": "form_descriptions/2278",
  "msg": "suspicious alt_of/form_of with '(': significant figure(s)",
  "path": [
    "sf"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "sf",
  "trace": ""
}