"kk." meaning in Icelandic

{
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "noun",
        "g": "n"
      },
      "expansion": "kk. n",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "karlkyn"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Icelandic links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of karlkyn."
      ],
      "id": "en-kk.-is-noun-w0cX5eYj",
      "links": [
        [
          "karlkyn",
          "karlkyn#Icelandic"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "neuter"
      ]
    }
  ],
  "word": "kk."
}

{
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "noun",
        "g": "n"
      },
      "expansion": "kk. n",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "karlkyn"
        }
      ],
      "categories": [
        "Icelandic abbreviations",
        "Icelandic entries with incorrect language header",
        "Icelandic lemmas",
        "Icelandic links with redundant wikilinks",
        "Icelandic neuter nouns",
        "Icelandic nouns",
        "Icelandic terms spelled with .",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Abbreviation of karlkyn."
      ],
      "links": [
        [
          "karlkyn",
          "karlkyn#Icelandic"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "neuter"
      ]
    }
  ],
  "word": "kk."
}