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印刷印刷術語


数字字母公式数学表达式复合物水分子式基线文字处理软件Microsoft Word





下标,也叫下角标脚标,是出现在一列正常字体下边的数字、字母或其他標誌,特别是用于公式、数学表达式或化学复合物的描述,例如水的分子式“H2O”中的数字“2”。


在印刷上,下标设置成低于基线,字型小于其他文字。比如,要正确的排出“H2O”,“2”必须设成“H”和“O”大小的 2/3 左右。这在许多文字编辑和文字处理软件中可自动完成(例如Microsoft Word)。



軟體設定


  • 在 Microsoft Word,可以「CTRL + =」指令使用下標文字,或是點選「字型」設定

  • 在 HTML 和 wikitext,可將下标文字放在<sub></sub>標籤的中间


  • Unicode 定义了一些常用的下标,如₀₁₂₃₄₅₆₇₈₉₊₋₌₍₎ (U+2080–U+209F)


  • TeX 的数学模式中(在MediaWiki使用),下标用下划线 _ 设置: $X_ab$ 生成 Xabdisplaystyle X_ab


参考文献





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