z-Axis

$\begin{figure}\begin{center}\BoxedEPSF{ZAxis.epsf}\end{center}\end{figure}$

The axis in 3-D Cartesian Coordinates which is usually oriented vertically. Cylindrical Coordinates are defined such that the -axis is the axis about which the azimuthal coordinate $\theta$ is measured.

See also Axis, x-Axis, y-Axis