DS.  Below is the standard list that I use from PCB Libraries.

A Assembly K Relay
AR Amplifier L Coil; Inductor
AT Attenuator; Isolator LS Loud Speaker/Buzzer
B Blower M Motor
BR Bridge Rectifier MG Motor Generator
BT Battery MH Mounting Hole
C Capacitor MK Microphone
CB Circuit Breaker MP Mechanical Part
CN Capacitor Network P Plug Type Connector
CP Coupler PS Power Supply
CR Silicon Rectifier Q Transistor
D Diode; Thyristor; Varacter R Resistor
DC Directional Coupler RN Resistor Network
DP Diplexer RT Thermistor
DL Delay Line S Switch
DS Display; LED Lamp T Transformer
E Terminal TB Terminal Block
F Fuse TC Thermocouple
FB Ferrite Bead TP Test Point
FD Fiducial U Tuner
FL Filter U Integrated Circuit
G Generator V Electron Tube
HW Hardware VR Voltage Regulator
HY Circulator W Cable Transmission
I or ICT In Circuit Test Point X Sub-circuit
J Jack Connector Y Crystal or Oscillator
JP Configuration Jumper Z Ref Des Suppressed


At 08:34 AM 8/1/2013, Jack Olson wrote:
>Just out of curiosity, what Reference Designator
>(or "Class Designation Letter", for you purists!)
>are you using for an
>*LED*?
>
>
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