- N
- Number of turns in an inductor
- N
- Revolutions per minute
- n
- Nano (10-9)
- N
- Negative
- nA
- Nanoampere
- NC
- Normally closed
- NC
- No connection
- NEG, neg
- Negative
- nF
- Nanofarad
- nH
- Nanohenry
- nm
- Nanometer
- NO
- Normally open
- NPN
- Negative-positive-negative
- ns
- Nanosecond
- nW
- Nanowatt
- OP AMP
- Operational amplifier
- P
- Pico (10-12)
- P
- Power
- p
- Instantaneous power
- P
- Positive, also peak
- PA
- Public address or power amplifier
- pA
- Picoampere
- PAL
- Programmable Array Logic
- PAM, pam
- Pulse amplitude modulation
- Pap
- Apparent power
- Pav
- Average power
- PCB
- Printed circuit board
- PCM, pcm
- Pulse-code modulation
- PDM
- Pulse-duration modulation
- pF
- Picofarad
- PLD
- Programmable Logic Device
- PLL
- Phase locked loop
- PM
- Phase modulation, also Permanent magnet
- PNP
- Positive-negative-positive
- POT, pot
- Potentiometer
- P-P
- Peak to peak
- PPM
- Pulse-position modulation
- PRF
- Pulse repetition frequency
- PRT
- Pulse repetition time
- pw
- Pulse width
- PWM, pwm
- Pulse width modulation
- Q
- Charge, also quality
- q
- Instantaneous charge
- R
- Potentiometer
- R
- Resistance
- RAM
- Random access memory
- RC
- Resistance-capacitance, also Radio controlled
- rcvr
- Receiver
- rect
- Rectifier
- ref
- Reference
- rf
- Radio frequencies
- RF
- Radio frequencies
- RFI
- Radio frequency interference
- RL
- Load resistor
- RLC
- Resistance-capacitance-inductance
- RMS, rms
- Root mean square
- ROM
- Read only memory
- rpm
- Revolutions per minute
- SCR
- Silicon controlled rectifier
- SHF
- Super high frequency
- SIP
- Single in-line package
- SNR
- Signal-to-noise ratio
- SPDT
- Single pole double throw
- sq cm
- Square centimeter
- SSB
- Single sideband
- SW
- Short wave
- SWR
- Standing-wave ratio
- SYNC, sync
- Synchronous
- T
- Tera (1012)
- T
- Torque
- T
- Transformer
- t
- Time in seconds
- TC
- Time constant, also temperature coefficient
- TE
- Transverse electric
- temp
- Temperature
- THz
- Terahertz
- TM
- Transverse magnetic
- TR
- Transmit-receive
- TTL
- Transistor-transistor logic
- TV
- Television
- TWT
- Travelling wave tube
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