"rf" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "rf",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "radio frequency"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2009 February 27, P. Neumann et al., “Response to Comment on \"Multipartite Entanglement Among Single Spins in Diamond\"”, in Science, volume 323, number 5918, →DOI",
          "text": "In our basis, we drove four selective radio frequency (rf) transitions between all four eigenstates",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Initialism of radio frequency."
      ],
      "id": "en-rf-en-noun-JU8ZCmu9",
      "links": [
        [
          "radio frequency",
          "radio frequency#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "rf"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "rf",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "radio frequency"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms with quotations",
        "English words without vowels"
      ],
      "examples": [
        {
          "ref": "2009 February 27, P. Neumann et al., “Response to Comment on \"Multipartite Entanglement Among Single Spins in Diamond\"”, in Science, volume 323, number 5918, →DOI",
          "text": "In our basis, we drove four selective radio frequency (rf) transitions between all four eigenstates",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Initialism of radio frequency."
      ],
      "links": [
        [
          "radio frequency",
          "radio frequency#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "rf"
}