Colon (punctuation)
A colon is a punctuation mark, with one dot above another, like this: ":".Colons are commonly used to introduce lists, or to connect a broad idea with a specific example: two related sentences can be separated by colons instead of periods.
Computer representation
In computer programming, the colon corresponds to Unicode and ASCII character 58, or 0x003A.
Other meanings
Colon (anatomy)