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 ]   audio   plural A’s or As in Western audio, the sixth Notice in the size (= series of notes) that commences over the Observe C, or maybe a set of notes based upon this Notice In algebra, the