There are many places on the Internet to get alt-codes. Just Google "alt codes" and you will find them.

View MySpace alt codes list here http://knopok.net/symbol-codes/alt-codes.html .

Alt codes are characters not immediately available on a standard keyboard

See the link below for a list of Alt codes.

alt codes is the most common name (i do not think there is any other) (but there might)

yes there are alt codes on runescape but theyre different than ones on the other things you usually type in. but somethings are the same just like this website. for exaple. ¿ is alt 5544 ¥ is alt 4253 ° is alt 55544. thers alot more than that.