What you are looking for is not a font. It is a UBB code you can use forums, chatrooms and so.
It works like this:
(color=red)This text is red(/color) (color=green)This text is green(/color) where you replace the brackets () by square brackets [] . The result is:
[color=red:b1a10a1955]This text is red[/color:b1a10a1955] [color=green:b1a10a1955]This text is green[/color:b1a10a1955]
I am looking for a font that you can use in chat rooms that has differant colrs when you type ... if this is/is not a font please let me know what type it is and if not a font could you let m know what utility it is