"UF" meaning in Spanish

{
  "forms": [
    {
      "form": "UF",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "#"
      },
      "expansion": "UF f (plural UF)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Unidad de Fomento"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Chilean Spanish",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "es",
          "name": "Finance",
          "orig": "es:Finance",
          "parents": [
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of Unidad de Fomento."
      ],
      "id": "en-UF-es-noun-Q6LovcFN",
      "links": [
        [
          "finance",
          "finance#Noun"
        ],
        [
          "Unidad de Fomento",
          "w:Unidad de Fomento"
        ]
      ],
      "raw_glosses": [
        "(Chile, finance) Initialism of Unidad de Fomento."
      ],
      "tags": [
        "Chile",
        "abbreviation",
        "alt-of",
        "feminine",
        "initialism"
      ],
      "topics": [
        "business",
        "finance"
      ]
    }
  ],
  "word": "UF"
}

{
  "forms": [
    {
      "form": "UF",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "#"
      },
      "expansion": "UF f (plural UF)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Unidad de Fomento"
        }
      ],
      "categories": [
        "Chilean Spanish",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish feminine nouns",
        "Spanish initialisms",
        "Spanish lemmas",
        "Spanish nouns",
        "es:Finance"
      ],
      "glosses": [
        "Initialism of Unidad de Fomento."
      ],
      "links": [
        [
          "finance",
          "finance#Noun"
        ],
        [
          "Unidad de Fomento",
          "w:Unidad de Fomento"
        ]
      ],
      "raw_glosses": [
        "(Chile, finance) Initialism of Unidad de Fomento."
      ],
      "tags": [
        "Chile",
        "abbreviation",
        "alt-of",
        "feminine",
        "initialism"
      ],
      "topics": [
        "business",
        "finance"
      ]
    }
  ],
  "word": "UF"
}