"trifid cipher" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "trifid cipher",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cryptography",
          "orig": "en:Cryptography",
          "parents": [
            "Computer science",
            "Formal sciences",
            "Mathematics",
            "Computing",
            "Sciences",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Coordinate term: bifid cipher"
        }
      ],
      "glosses": [
        "A classical cipher that extends the earlier bifid cipher with the use of trigrams."
      ],
      "id": "en-trifid_cipher-en-noun-fNUGALIo",
      "links": [
        [
          "cryptography",
          "cryptography"
        ],
        [
          "classical",
          "classical"
        ],
        [
          "cipher",
          "cipher"
        ],
        [
          "bifid cipher",
          "bifid cipher"
        ],
        [
          "trigram",
          "trigram"
        ]
      ],
      "raw_glosses": [
        "(cryptography) A classical cipher that extends the earlier bifid cipher with the use of trigrams."
      ],
      "topics": [
        "computing",
        "cryptography",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "trifid cipher"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "trifid cipher",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "en:Cryptography"
      ],
      "examples": [
        {
          "text": "Coordinate term: bifid cipher"
        }
      ],
      "glosses": [
        "A classical cipher that extends the earlier bifid cipher with the use of trigrams."
      ],
      "links": [
        [
          "cryptography",
          "cryptography"
        ],
        [
          "classical",
          "classical"
        ],
        [
          "cipher",
          "cipher"
        ],
        [
          "bifid cipher",
          "bifid cipher"
        ],
        [
          "trigram",
          "trigram"
        ]
      ],
      "raw_glosses": [
        "(cryptography) A classical cipher that extends the earlier bifid cipher with the use of trigrams."
      ],
      "topics": [
        "computing",
        "cryptography",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "trifid cipher"
}