E

The fifth letter of the Roman alphabet, derived from the Greek letter epsilon which is pretty much the same in appearance and function. Like other latin vowels, e came in a long (sounded as in they) and a short variety (sounded as in pet). In other languages which use the letter it takes on various other values, sometimes with accents to indicate which one (ê,é,è,ë).

On computers the uppercase letter is represented with ASCII code 69 and the lowercase letter with code 101. This is the most common letter in English and many related languages, which has some implications in Cryptography.