aA bA cA dA eA fA gA hA iA jA kA lA mA nA oA pA qA rA sA tA uA vA wA xA yA zA[ C/U ]   tunes   plural A’s or As in Western audio, the sixth note in the dimensions (= number of notes) that begins on the Observe C, or simply a set of notes dependant on this NoticeWhen the ancient Greeks adopted the alphabet, they had no use to get a letter symbol