use character map

it's in accesories --> system tools

have fun

unless you wanna memorize it, u can google for "ASCII CODES"

here are some for you to try

press alt + numbers

for example:
alt + 12 = ♀
alt + 258 = ☻
alt + 9999 = ☼

and so on...

i hope u have sumthin else better to do with your memory rather than memorizing it

see... do a simple search on "ASCII character code" on google and u'll find the table

http://www.google.com/search?q=ascii+chara...:en-US:official

here, do have fun memorizing them.

if u have more time, try the extended ASCII