> 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-cn/geng-duo-zhu-ti/43-table-of-tex-category-codes.md).

# TeX 类别码表

| **类别码** | **说明**                           | **标准 LATEX/TEX**                 |
| ------- | -------------------------------- | -------------------------------- |
| 0       | 转义字符——告诉 TEX 开始查找命令              | `\`                              |
| 1       | 开始一个组                            | {                                |
| 2       | 结束一个组                            | }                                |
| 3       | 数学切换——进入/退出数学模式                  | $                                |
| 4       | 对齐制表符                            | &                                |
| 5       | 行尾                               | ASCII 码 13（`\r`)                 |
| 6       | 宏参数                              | #                                |
| 7       | 上标——用于排版数学： `$y=x^2$` $$y=x^2$$  | ˆ                                |
| 8       | 下标——用于排版数学： `$y=x_2$` $$y=x\_2$$ | \_                               |
| 9       | 被忽略的字符                           | ASCII 0 `<空>`                    |
| 10      | 空白符                              | ASCII 码 32（空格）和 9（制表符）           |
| 11      | 字母                               | A...Z，a...z，（以及成千上万的 Unicode 字符） |
| 12      | 其他                               | 0...9 以及 ,.;?" 和许多其他字符           |
| 13      | 活动字符                             | 用于创建单字符宏的特殊类别代码，例如 ˜             |
| 14      | 注释字符——忽略其后直到行尾的所有内容              | %                                |
| 15      | 无效字符，不允许出现在 .tex 输入文件中           | ASCII 码 127（`DEL`)               |


---

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