Hank Wallace, President of Atlantic Quality Design, Inc. (contract designers of embedded systems and electronic products) recommends the following from his Electronics Design Checklist (item #61 - Preferred component reference designators).

see http://www.chipcenter.com/eexpert/h...ce001.html

1. R fixed resistor
2. RN resistor network
3. RV variable resistor
4. C capacitor (network, fixed or variable)
5. L inductor
6. Q transistor, FET, SCR, TRIAC
7. D,CR diode, rectifier, Zener, varicap, LED
8. DL multisegment display (any type)
9. VR,Q,IC voltage regulator
10. U,IC integrated circuit
11. J socket, jack (female) OR the half that is stationary
12. P plug (male) OR the half that is attched to a cable/wire
13. JP jumper (pins, trace, or wire)
14. Y,X crystal
15. M modular subassembly, daughter board
16. S mechanical switch
17. F fuse
18. FL filter
19. T transformer
20. KB keyboard
21. B,BT battery

- Jeff