short for (something)
Being an abbreviation or shortened form of some longer name, word, or phrase. "BAFTA" is short for British Academy of Film and Television Arts. I go by "Rick"—short for "Ricardo," not "Richard."
short for something
[of a form] being a shortened form of a word or phrase. Photo is short for photograph. Dave is short for David.
short for
An abbreviation of: Ed is short for Edward.