"LH2" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "LH2",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(a liquid composed of the liquid phase of molecular hydrogen (H₂))",
          "word": "liquid hydrogen"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Cryogenics",
          "orig": "en:Cryogenics",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Hydrogen",
          "orig": "en:Hydrogen",
          "parents": [
            "Chemical elements",
            "Matter",
            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of liquid hydrogen (a liquid composed of the liquid phase of molecular hydrogen (H₂))"
      ],
      "id": "en-LH2-en-noun-bf5q3ZPN",
      "links": [
        [
          "liquid",
          "liquid#English"
        ],
        [
          "hydrogen",
          "hydrogen#English"
        ],
        [
          "liquid phase",
          "liquid phase#English"
        ]
      ],
      "related": [
        {
          "word": "LO2"
        },
        {
          "word": "LOX"
        },
        {
          "word": "LOx"
        },
        {
          "word": "lox"
        },
        {
          "word": "LN2"
        },
        {
          "word": "LHe"
        },
        {
          "word": "LNG"
        },
        {
          "word": "LPG"
        }
      ],
      "synonyms": [
        {
          "word": "H2(l)"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "LH2"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "LH2",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "LO2"
    },
    {
      "word": "LOX"
    },
    {
      "word": "LOx"
    },
    {
      "word": "lox"
    },
    {
      "word": "LN2"
    },
    {
      "word": "LHe"
    },
    {
      "word": "LNG"
    },
    {
      "word": "LPG"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(a liquid composed of the liquid phase of molecular hydrogen (H₂))",
          "word": "liquid hydrogen"
        }
      ],
      "categories": [
        "English abbreviations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms spelled with numbers",
        "English words without vowels",
        "en:Cryogenics",
        "en:Hydrogen"
      ],
      "glosses": [
        "Abbreviation of liquid hydrogen (a liquid composed of the liquid phase of molecular hydrogen (H₂))"
      ],
      "links": [
        [
          "liquid",
          "liquid#English"
        ],
        [
          "hydrogen",
          "hydrogen#English"
        ],
        [
          "liquid phase",
          "liquid phase#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "H2(l)"
    }
  ],
  "word": "LH2"
}