A pangram is a sentence that uses each letter of the alphabet at least once.
- Pack my box with five dozen liquor jugs.
- How vexingly quick daft zebras jump.
A perfect pangram uses each letter of the alphabet exactly once.
- TV quiz jock, Mr. PhD, bags few lynx.
But what word/phrase describes a sentence that uses each letter at most once?
- Bide my frog’s quack.
- Jaws flunked copyright.
- Put back my English word!
Surprisingly, I can’t find any reference to sentences of this type either in a quick scan of Word Ways or in Ross Eckler’s Making the Alphabet Dance.