If real numbers are in -LSB- math -RSB- x -LSB- / math -RSB- - axis and complex numbers in -LSB- math -RSB- y -LSB- / math -RSB- - axis , what is in the -LSB- math -RSB- z -LSB- / math -RSB- - axis ?
If the real numbers are usually placed on the -LSB- math -RSB- x -LSB- / math -RSB- - axis and imaginary numbers placed on the -LSB- math -RSB- y -LSB- / math -RSB- - axis , what would be placed on the -LSB- math -RSB- z -LSB- / math -RSB- - axis ?