~

(pronounced: till-da)

In online usage, this scribbly horizontal line used to signify an individual user's Web site that is housed on the server of an ISP, but it has largely been replace with /user/ folder. For example, it used to say http://www.well.com/~silly but now it says http://www.well.com/user/silly

The tilde also means "at" or "around" or "approximately" as in "Let's meet in front of the restaurant ~7pm." You will also see it used in smileys ;-)~

In symbolic language, it also means "or" whereas the = sign means "and" for example, "[[2B~not2B]]"  = "To be or not to be."