YAC is a three-letter abbreviation with multiple meanings, as described below:
Yeast artificial chromosome,
Youth Advisory Committee of Cuyahoga County,
Youth Advisory Council,
York Against Cancer,
Yards after catch, a term in American football,
The Yale Alley Cats, an all-male a cappella group,
The IATA code for Cat Lake Airport,
You might also be looking for Yak (disambiguation).
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