Computer Architecture, Instruction Set, Intel, X86, Computer Science.
it's [EAX]. EAX is a 32-bit general-purpose register. [EAX] is a cool way of saying the memory address specified by the register EAX. The reg value of 18 is 011. If we look up along the column of 18, we see that the table mentions that. It gives a bunch of possible registers for the second operand.