"crossed letter" meaning in English

{
  "forms": [
    {
      "form": "crossed letters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "crossed letter (plural crossed letters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Calligraphy",
          "orig": "en:Calligraphy",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "History of the United Kingdom",
          "orig": "en:History of the United Kingdom",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Post",
          "orig": "en:Post",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Printing",
          "orig": "en:Printing",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Writing",
          "orig": "en:Writing",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A letter written using the method by which text is written in one direction, the paper is then turned ninety degrees, and then additional text is written perpendicularly over the first set, creating a grid; mainly in order to save paper and expensive postage in the 19th century."
      ],
      "id": "en-crossed_letter-en-noun-kwVlRiXr",
      "links": [
        [
          "letter",
          "letter"
        ],
        [
          "method",
          "method"
        ],
        [
          "text",
          "text"
        ],
        [
          "written",
          "written"
        ],
        [
          "direction",
          "direction"
        ],
        [
          "additional",
          "additional"
        ],
        [
          "perpendicular",
          "perpendicular"
        ],
        [
          "in order to",
          "in order to"
        ],
        [
          "save",
          "save"
        ],
        [
          "paper",
          "paper"
        ],
        [
          "expensive",
          "expensive"
        ],
        [
          "postage",
          "postage"
        ]
      ],
      "raw_glosses": [
        "(historical) A letter written using the method by which text is written in one direction, the paper is then turned ninety degrees, and then additional text is written perpendicularly over the first set, creating a grid; mainly in order to save paper and expensive postage in the 19th century."
      ],
      "related": [
        {
          "word": "cross write"
        },
        {
          "word": "cross-writing"
        }
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "crossed letter"
}

{
  "forms": [
    {
      "form": "crossed letters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "crossed letter (plural crossed letters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "cross write"
    },
    {
      "word": "cross-writing"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Calligraphy",
        "en:History of the United Kingdom",
        "en:Post",
        "en:Printing",
        "en:Writing"
      ],
      "glosses": [
        "A letter written using the method by which text is written in one direction, the paper is then turned ninety degrees, and then additional text is written perpendicularly over the first set, creating a grid; mainly in order to save paper and expensive postage in the 19th century."
      ],
      "links": [
        [
          "letter",
          "letter"
        ],
        [
          "method",
          "method"
        ],
        [
          "text",
          "text"
        ],
        [
          "written",
          "written"
        ],
        [
          "direction",
          "direction"
        ],
        [
          "additional",
          "additional"
        ],
        [
          "perpendicular",
          "perpendicular"
        ],
        [
          "in order to",
          "in order to"
        ],
        [
          "save",
          "save"
        ],
        [
          "paper",
          "paper"
        ],
        [
          "expensive",
          "expensive"
        ],
        [
          "postage",
          "postage"
        ]
      ],
      "raw_glosses": [
        "(historical) A letter written using the method by which text is written in one direction, the paper is then turned ninety degrees, and then additional text is written perpendicularly over the first set, creating a grid; mainly in order to save paper and expensive postage in the 19th century."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "crossed letter"
}