"letter jacket" meaning in English

{
  "forms": [
    {
      "form": "letter jackets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "letter jacket (plural letter jackets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Spanish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Clothing",
          "orig": "en:Clothing",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "letter-jacketed"
        }
      ],
      "glosses": [
        "A jacket traditionally worn by high-school and college students to represent school and team pride or to display their athletic or academic awards."
      ],
      "id": "en-letter_jacket-en-noun-ve7nQJc0",
      "links": [
        [
          "student",
          "student"
        ],
        [
          "school",
          "school"
        ],
        [
          "team",
          "team"
        ],
        [
          "pride",
          "pride"
        ],
        [
          "athletic",
          "athletic"
        ],
        [
          "academic",
          "academic"
        ],
        [
          "award",
          "award"
        ]
      ],
      "raw_glosses": [
        "(US) A jacket traditionally worn by high-school and college students to represent school and team pride or to display their athletic or academic awards."
      ],
      "related": [
        {
          "word": "letterman"
        },
        {
          "word": "varsity letter"
        }
      ],
      "synonyms": [
        {
          "word": "letterman jacket"
        },
        {
          "word": "varsity jacket"
        }
      ],
      "tags": [
        "US"
      ],
      "translations": [
        {
          "code": "es",
          "lang": "Spanish",
          "lang_code": "es",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "chaqueta de letra"
        }
      ],
      "wikipedia": [
        "Richard Nixon",
        "Whittier High School"
      ]
    }
  ],
  "word": "letter jacket"
}

{
  "derived": [
    {
      "word": "letter-jacketed"
    }
  ],
  "forms": [
    {
      "form": "letter jackets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "letter jacket (plural letter jackets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "letterman"
    },
    {
      "word": "varsity letter"
    }
  ],
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Spanish translations",
        "Translation table header lacks gloss",
        "en:Clothing"
      ],
      "glosses": [
        "A jacket traditionally worn by high-school and college students to represent school and team pride or to display their athletic or academic awards."
      ],
      "links": [
        [
          "student",
          "student"
        ],
        [
          "school",
          "school"
        ],
        [
          "team",
          "team"
        ],
        [
          "pride",
          "pride"
        ],
        [
          "athletic",
          "athletic"
        ],
        [
          "academic",
          "academic"
        ],
        [
          "award",
          "award"
        ]
      ],
      "raw_glosses": [
        "(US) A jacket traditionally worn by high-school and college students to represent school and team pride or to display their athletic or academic awards."
      ],
      "synonyms": [
        {
          "word": "letterman jacket"
        },
        {
          "word": "varsity jacket"
        }
      ],
      "tags": [
        "US"
      ],
      "wikipedia": [
        "Richard Nixon",
        "Whittier High School"
      ]
    }
  ],
  "translations": [
    {
      "code": "es",
      "lang": "Spanish",
      "lang_code": "es",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "chaqueta de letra"
    }
  ],
  "word": "letter jacket"
}