P
p 1. Abbreviation for power (combining form, as in pf for power factor), or plate of an electron tube. 2. Letter symbol for the prefix pico- (10−12).
P Symbol for permeance.
pA Letter symbol for picoampere.
PABX or pabx Abbreviation for private automatic branch exchange. 1. A small, local, user-owned automatic telephone exchange serving extensions in a business complex that accommodates the transmission of calls to and from the public telephone network. 2. A private branch exchange in which connections are made by remote-controlled switches.
pacemaker Also called pacer or electronic pacemaker. An electronic instrument for starting and/or maintaining the heartbeat. The instrument is essentially a pulse generator with its output applied either ...
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