> 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/wen-yu-da/87-why-can-t-i-use-bullet-without-getting-a-syntax-error.md).

# 為什麼我不能使用 \bullet 而不產生語法錯誤？

該 `\bullet` 此命令是為了在數學模式中使用而定義的，因此你需要寫入 `$\bullet$` （或 `\(\bullet\)`）即可在你的文字中使用此命令。如果你使用 `\bullet` 在數學模式外使用它，將會產生錯誤 [`缺少插入的 $`](/latex/zh-tw/latex-cuo-wu/25-missing-inserted.md).

或者， `\textbullet` 此命令可在數學模式外使用，無需美元符號或 `\(...\)`，如下列範例所示：

```latex
\documentclass{article}
\title{\LaTeX 中的隨機漫步}
\author{Overleaf 團隊}
\begin{document}
\maketitle
\section{一開始...}
此範例示範在數學模式中使用 \verb|\bullet|，產生 \(\bullet\)；以及在數學模式外使用 \verb|\textbullet|，也會產生 \textbullet。
\end{document}
```

[在 Overleaf 中開啟此範例](https://www.overleaf.com/docs?engine=pdflatex\&snip_name=Using+the+bullet+command\&snip=%5Cdocumentclass%7Barticle%7D%0A%5Ctitle%7BA+random+walk+in+%5CLaTeX%7D%0A%5Cauthor%7BOverleaf+Team%7D%0A%5Cbegin%7Bdocument%7D%0A%5Cmaketitle%0A%5Csection%7BIn+the+beginning...%7D%0AThis+example+demonstrates+using+%5Cverb%7C%5Cbullet%7C+in+math+mode%2C+producing+%5C%28%5Cbullet%5C%29+and+%5Cverb%7C%5Ctextbullet%7C+outside+math+mode%2C+also+producing+%5Ctextbullet.%0A%5Cend%7Bdocument%7D)

此範例會產生以下輸出：

![在 Overleaf 上使用 \bullet 和 \textbullet 命令](/files/867a68486751edb8440cb553b79e6f38a68cf45b)


---

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