"T2" meaning in English

{
  "etymology_text": "* Transit + 2 occupants.",
  "forms": [
    {
      "form": "T2s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "T2 (plural T2s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Australian English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "New Zealand English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "T2 relaxation time"
        }
      ],
      "glosses": [
        "a transit lane restricted to vehicles with a minimum of two occupants."
      ],
      "id": "en-T2-en-noun-~V5VtE3F",
      "links": [
        [
          "transit lane",
          "transit lane"
        ]
      ],
      "raw_glosses": [
        "(Australia, New Zealand) a transit lane restricted to vehicles with a minimum of two occupants."
      ],
      "tags": [
        "Australia",
        "New-Zealand"
      ]
    }
  ],
  "word": "T2"
}

{
  "derived": [
    {
      "word": "T2 relaxation time"
    }
  ],
  "etymology_text": "* Transit + 2 occupants.",
  "forms": [
    {
      "form": "T2s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "T2 (plural T2s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Australian English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms spelled with numbers",
        "English words without vowels",
        "New Zealand English",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "glosses": [
        "a transit lane restricted to vehicles with a minimum of two occupants."
      ],
      "links": [
        [
          "transit lane",
          "transit lane"
        ]
      ],
      "raw_glosses": [
        "(Australia, New Zealand) a transit lane restricted to vehicles with a minimum of two occupants."
      ],
      "tags": [
        "Australia",
        "New-Zealand"
      ]
    }
  ],
  "word": "T2"
}