"isf" meaning in Swedish

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "phrase"
      },
      "expansion": "isf",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "phrase",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "in that case",
          "word": "i så fall"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Swedish links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of i så fall (“in that case”)."
      ],
      "id": "en-isf-sv-phrase-3Mku3KwC",
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "text messaging",
          "text messaging"
        ],
        [
          "i så fall",
          "i så fall#Swedish"
        ]
      ],
      "raw_glosses": [
        "(Internet slang, text messaging) Initialism of i så fall (“in that case”)."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "isf"
}

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "phrase"
      },
      "expansion": "isf",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "phrase",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "in that case",
          "word": "i så fall"
        }
      ],
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Swedish entries with incorrect language header",
        "Swedish initialisms",
        "Swedish internet slang",
        "Swedish lemmas",
        "Swedish links with redundant alt parameters",
        "Swedish phrases",
        "Swedish text messaging slang"
      ],
      "glosses": [
        "Initialism of i så fall (“in that case”)."
      ],
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "text messaging",
          "text messaging"
        ],
        [
          "i så fall",
          "i så fall#Swedish"
        ]
      ],
      "raw_glosses": [
        "(Internet slang, text messaging) Initialism of i så fall (“in that case”)."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "isf"
}