Backspace
Tab Enter
Caps Lock

Greek

Output type: raw decimal hex UTF8
Output size: small medium large x-large xx-large
Output font: Aristarcoj Hellas Times AvantGreek Georgia Greek Asteria
Output:

Clear
output

Greek alphabet, upper-case
Greek alphabet, lower-case
digamma old koppa sampi heta old sampi Pamphylian
digamma		 sho san variant characters and other symbols
variant characters and other symbols
variant characters and other symbols
combining symbols

References

Unicode 5.2 Character Code Charts

Wikipedia on "Greek alphabet"

A Greek keyboard

Some Greek fonts

Other alphabets