*W*A*R*N*I*N*G* When you use the quit command through either method:
'quit
-OR-
File -> Quit Character
This will PERMANENTLY delete your character.
Yes, this is as in gone forever*!
* Some servers and/or admins may have a backup method in place to restore a character, but this depends on how often the backup scheme is scheduled - you can lose anywhere from a few hours to days to even week(s) of progress if/when your character is restored.