What is a prefix for colon?

There isn't a specific prefix that directly means "colon" in English. The colon (:) is a punctuation mark, and prefixes are typically used to modify words, not punctuation marks.

If you're looking for a word or phrase that describes the colon, you could use:

* "The colon" - This is the simplest and most direct way to refer to the punctuation mark.

* "Colon punctuation" - This emphasizes that it's a punctuation mark.

* "The symbol ':'" - This emphasizes its visual appearance.

Alternatively, you could use a word that describes its function:

* "Introduction" - If the colon is used to introduce a list or explanation.

* "Separation" - If the colon is used to separate two parts of a sentence.

The best choice will depend on the specific context.