Z: A symbol used in pumping to indicate a pump’s hydrodynamic size.
Z-axis: When referring to a three-dimensional plane, a z-axis refers to the depth of a three-dimensional object.
Zero percent head loss NPSHR (NPSH0): The lowest NPSHR by a pump that results in zero head loss from the performance curve when tested with enough NPSHA.
Zymaxx: The trade name for a composite material containing carbon fibers. Used to make pump components such as bearings, wear ring inserts, bushings, etc.