EF

Proper noun

 * 1)   an open-source ORM framework.
 * 2)  Followed by a number from 0 to 5:, a rating on the Enhanced Fujita scale used to indicate the intensity of a tornado. It has superseded the Fujita scale.

Noun

 * 1)  one-year volunteer (abbreviation of Einjährig-Freiwilliger)

Usage notes

 * The plural often takes no ending in formal standard German. In less formal speech, however, -s is only rarely omitted.