EBP. This register is called the base pointer as its most common use is to point to the base of a stack frame during function calls. However, unlike the previously discussed registers, you may use any other register for this purpose if needed.

Another register worth mentioning here is EBX, which, in the good old days of 16-bit modes (when it was still just a BX register), was one of the few registers that we could use as a base for addressing. Unlike EBP, EBX was (in the case of the XLAT instruction, which by default uses DS:EBX, still is) intended to point to a data segment.