DesignatorComponent Type
ASeparable assembly or sub-assembly (e.g. printed circuit assembly)
ARAmplifier
AT

Attenuator or isolator

BBlower, Motor
BTBattery
CCap: Fixed, Variable, Multi-element
CBCircuit Breaker, Network protector
CPConnector Adapter, Coupling
DDiode (including TVS, thyristor, Zener)
DCdirectional coupler
DLDelay line
DSDisplay, Lamp, LED - , Visual Indicator
EANT, Terminal, Ferrite Bead Ring, Misc. Electrical Part
FFuse
FDFiducial
FLFilter
GGenerator or oscillator
HHardware
HYCirculator
JJack (least-movable connector of a connector pair) | Jack connector (connector may have "male" pin contacts and/or "female" socket contacts)
JPJumper (Link)
KRelay or contactor
LInductor or coil
LSLoudspeaker or buzzer
MMeter
MGMotor-generator
MHmounting hole
MKMicrophone
MPMechanical part (including screws and fasteners)
PPlug (most-movable connector of a connector pair) | Plug connector (connector may have "male" pin contacts and/or "female" socket contacts)
PSPower supply
QTransistor (all types), SCR
RResistor
RTThermistor, Thermal Resistor
RVSymmetrical Varistor
SSwitch (all types, including push-buttons)
TTransformer
TBTerminal Board, Terminal Strip
TCThermocouple
TPTest Point, In-circuit Test Points
UIntegrated circuit (IC)
VRVoltage regulator (e.g. voltage reference)
WWire, Cable, Cable Assembly
XSocket connector for another item not P or J, paired with the letter symbol for that item (XV for vacuum tube socket, XF for fuse holder, XA for printed circuit assembly connector, XU for integrated circuit connector, XDS for light socket, etc.)
YCrystal or oscillator
ZBalun, General Network, Phase Shifter
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