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--- title: Subscript syntax-id: subscript --- This isn't common, but some Markdown processors allow you to use *subscript* to position one or more characters slightly below the normal line of type. To create a subscript, use one tilde symbol (`~`) before and after the characters. ```text H~2~O ``` The rendered output looks like this: H2O
Tip: Be sure to test this in your Markdown application before using it. Some Markdown applications use one tilde symbol before and after words not for subscript, but for strikethrough.
Alternatively, if your Markdown application supports [HTML](/basic-syntax/#html), you can use the `sub` HTML tag. ```html H2O ```