What does X mean in EAX,EBX,ECX … in assembly?

Question

Google doesn\'t show the result,

Anyone knows?

Answer 1

Nothing, as far as I know. It stands for a general purpose register.

The 16 bit AX register can be addressed as AH (high byte) and AL (low byte).

The EAX register is the 32 bit version of the AX register. The E stands for extended.