The way to display it is to use the "character entity" in HTML, which is √ -- that's ampersand, number sign, 8, 7, 3, 0, semicolon.
So you would type 2√ in your message to display 2ã
Hope that helps.
Edit: It was fun figuring out how to get the message to show √ rather than √
[This message has been edited by ThinkGood (edited 07-02-2003).]