All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases on a collision class idiomAbout 1000 bce, in Byblos and various Phoenician and Canaanite centres, the sign was provided a linear sort (three), the source of all afterwards forms. In Semitic languages this signal was identified as alephIn algebra, the letter a together with differ