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 course idiomAbout one thousand bce, in Byblos along with other Phoenician and Canaanite centres, the signal was given a linear sort (3), the supply of all afterwards forms. In Semitic languages this signal was identified as alephIn algebra, the letter a as well as