"BCU" meaning in English

{
  "forms": [
    {
      "form": "BCUs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "BCU (plural BCUs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "big close-up"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
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          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Film",
          "orig": "en:Film",
          "parents": [
            "Entertainment",
            "Mass media",
            "Culture",
            "Media",
            "Society",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of big close-up."
      ],
      "id": "en-BCU-en-noun-LJ1VATgH",
      "links": [
        [
          "film",
          "film#Noun"
        ],
        [
          "big",
          "big#English"
        ],
        [
          "close-up",
          "close-up#English"
        ]
      ],
      "raw_glosses": [
        "(film) Initialism of big close-up."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "topics": [
        "broadcasting",
        "film",
        "media",
        "television"
      ]
    }
  ],
  "word": "BCU"
}

{
  "forms": [
    {
      "form": "BCUs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "BCU (plural BCUs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "big close-up"
        }
      ],
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        "English countable nouns",
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        "English initialisms",
        "English lemmas",
        "English nouns",
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        "en:Film"
      ],
      "glosses": [
        "Initialism of big close-up."
      ],
      "links": [
        [
          "film",
          "film#Noun"
        ],
        [
          "big",
          "big#English"
        ],
        [
          "close-up",
          "close-up#English"
        ]
      ],
      "raw_glosses": [
        "(film) Initialism of big close-up."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ],
      "topics": [
        "broadcasting",
        "film",
        "media",
        "television"
      ]
    }
  ],
  "word": "BCU"
}