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You can mark up an abbreviation using the <abbr> tag. For example this:

<abbr title="World Wide Web">WWW</abbr>

renders like this: WWW.

There’s also <acronym>, which works the same: NASA.

Kramdown also provides a way to define abbreviations and have them be marked up in the text automatically. For example this:

This is some text not written in HTML but in another language!

*[another language]: It's called Markdown

*[HTML]: HyperTextMarkupLanguage

renders like this:

This is some text not written in HTML but in another language!