PZM (microphone)
PZM is an acronym for Pressure Zone Microphone; it generally refers to a "boundary microphone" in which a small omnidirectional condenser mic capsule faces a boundary a few thousandths of an inch away. PZM is a trademark of Crown International.
The PZM can be used as a piano mic or on hockey boards for body check sound effects. It is also commonly used to record full room sound by being mounted on a wall.
Read more about PZM (microphone): Development, The Directional Boundary Microphone