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S Siemens
S Source of an f.e.t.
s Second (unit of Time)
s.h.f. Super high frequency
s.w. Short wave (approx. 10-60m)
s.w.g. Standard wire gauge
s.w.r. Standing wave ratio
s/c Short circuit
S/N Signal-to-noise
SAE Society of Automotive Engineers
SCART Syndicat des Constructeurs d'Appareils Radio Recepteurs et Televiseurs
SCR Silicon-controlled rectifier
SCSI Small Computer Systems Interface
SEMKO Svenska Elektriska Materielkontrollanstalten
SEV Schweizerischer Elektrotechnischer Verein
SI International system of units
SIM Subscriber Identity Module
SIMM Single in-line Memory Module
SIN Sine
SMA Sub-Miniature 'A' (co-ax connector)
SMB Sub-Miniature 'B' (co-ax connector)
SMC Sub-Miniature 'C' (co-ax connector)
SMD Surface Mount Device
SMT Surface Mount Technology
SNA Systems Network Architecture
SNMP Simple Network Management Protocol
SOD Small Outline Device
SOIC Small Outline Integrated Circuit
SOT Small Outline Transistor
SPDT Single pole, double throw
SPL Sound pressure level
spm strokes per minute
SPST Single, pole, single throw
SSI Small scale integration
STP Screened Twisted Pair Cable
SVGA Super Video Graphics Adapter
SWA Steel Wire Armoured
SWL Safe Working Load