Z

Z axis

Axis perpendicular to both X and Y axes.

zener diode

A Zener diode is specially designed so as to have a reduced breakdown voltage, the so-called Zener voltage. A Zener diode contains doped p-n junction allowing electrons to Channel from the valence band of the p-type material to the conduction band of the n-type material

zeroing

Calibrating a meter so that it shows a value of zero when zero is being measured