The Arcadian alphabet was invented to write Arcadia, an invented language used in the computer game the 'Skies of Arcadia'. The alphabet is used to write inscriptions throughout the game.
Font for Arcadia (La police d'Arcadia)
If you need to type in many different languages, the Q International Keyboard can help. It enables you to type almost any language that uses the Latin, Cyrillic or Greek alphabets, and is free.