YAG Views 13 meanings found YAG can denote the Yttrium Aluminum Garnet crystal used in lasers, the informal phrase Yet Another Game in gaming circles, or a Young Adult Group in community settings. Miscellaneous Yet Another Gallery Yttrium Aluminum and Garnet Community Youth Advisory Group Young Adult Group Young Adults Group Young Artists Guild Youth Advocacy Group Academic & Science Yttrium Aluminum Garnet Youth And Government Regional Fort Frances, Ontario, Canada Business Year At a Glance Young Actors Guild Sports Yet Another Game