AX or Ax may stand for: AX Accumulator eXtended (x86 registers in computing) Åland Islands (2-letter ISO country code) Alpha Chi Omega American Express Anime Expo AX architecture (Japanese computing architecture) Armani Exchange Atlantic Coast Line Railroad Autocross Automatic transmission Citroën AX F-Zero AX (video game) Trans States Airlines IATA code Ax axe, tool and weapon Bill Eadie, aka Axe, a WWF World Tag-Team Champion professional wrestler Aximili-Esgarr… (More on Ax)