> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/zh-tw/geng-duo-zhu-ti/43-table-of-tex-category-codes.md).

# TeX 類別碼表

| **類別碼** | **說明**                           | **標準 LaTeX/TeX**             |
| ------- | -------------------------------- | ---------------------------- |
| 0       | 逸脫字元——告訴 TeX 開始尋找命令              | `\\`                         |
| 1       | 開始一個群組                           | {                            |
| 2       | 結束一個群組                           | }                            |
| 3       | 數學切換——切換進入／離開數學模式                | $                            |
| 4       | 對齊定位符                            | &                            |
| 5       | 行尾                               | ASCII 編碼 13（`\r`)            |
| 6       | 巨集參數                             | #                            |
| 7       | 上標——用於排版數學： `$y=x^2$` $$y=x^2$$  | ˆ                            |
| 8       | 下標——用於排版數學： `$y=x_2$` $$y=x\_2$$ | \_                           |
| 9       | 被忽略的字元                           | ASCII 0 `<空值>`               |
| 10      | 間隔字元                             | ASCII 編碼 32（空格）和 9（Tab 鍵字元）  |
| 11      | 字母                               | A...Z、a...z，以及數千個 Unicode 字元 |
| 12      | 其他                               | 0...9 加上 ,.;?" 以及許多其他字元      |
| 13      | 活動字元                             | 用於建立單字元巨集的特殊類別代碼，例如 ˜        |
| 14      | 註解字元——忽略後面直到行尾的所有內容              | %                            |
| 15      | 無效字元，不允許出現在 .tex 輸入檔中            | ASCII 編碼 127（`刪除`)           |


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