Appendix X— AN NOMENCLATURE SYSTEM 



Part 2— Component indicators— Continued 



Component 

 indicator 



Family name 



Definition of example (not to be construed as limiting the 

 application of the component indicator) 



S 



Shelters 



House, tent, protective shelter, etc 



SB 



Switchboards 



Telephone, fire control, power panel, etc 



SG 



Signal 

 generators 



Includes test oscillators and noise generators. 



SM 



Simulators 



Flight, aircraft, target, signal, etc. 



SN 



Synchronizers 



Equipment to coordinate two or more functions. 



T 



Transmitters 



Transmitters, all types except telephone. 



TA 



Telephone 

 apparatus 



Miscellaneous telephone equipment. 



TD 



Timing device 



Mechanical and electronic timing devices, range devices, etc. 



TF 



Transformers 



Transformers when used as separate items. 



TS 



Test equipment 



Test and measuring equipment. 



TT 



Teletypewriter 

 and facsimile 

 apparatus 



Miscellaneous tape, teletype, facsimile. 



441 



