Pn

p-n Junction
Boundary or interface between two types of semiconductor material, p-type and n-type, inside a single crystal of semiconductor.
Pneumatic
Operated by air pressure.
Pneumatic Form
A concrete roof shape defined by inflating a bladder that gives a form defined by pressure loading.
PNP Transistor
Type of bipolar transistor using p-type, n-type, n-type semiconductor material.