E -
The grade below D in some grading systems. In most such systems, it is a failing grade.
Wikipedia
E is the fifth letter and a vowel in the basic modern Latin alphabet. It is the most commonly used letter in the Czech, Danish, Dutch, English, French, German, Hungarian, Latin, Norwegian, Spanish, and Swedish languages.
OmegaWiki Dictionary
Ω
E A spoken language in China
E A chemically modified amphetamine that has hallucinogenic as well as stimulant properties.