subnotebook computer personal digital assistantsubpathsubrefractionsubrocsubroutinesubscribersubscriber line interface circuitsubsectionsubsetsubsonicsubsplitsubstitutionsubstitution ciphersubstitution theoremsubstratesubsurface wavesubsynchronoussubsystemsubvectorsuccessivesuccessive approximation regidtersuface acoustic wave delay linesuhl effectsulfursulfur hexafluoridesulfuric acidsum channelsum snd differnce monopulse radarsummation bridgesummation checksummation network summing networksummersumming amplifiersumming pointsunlight recordersunspotsunspot cycle solar cyclesunspot numbersuper diodesuper vgasuperclasssuperconductingsuperconducting generatorsuperconducting memorysuperconducting solenoidsuperconducting thin filmsuperconducting transitionsuperconductive materialssuperconductivitysuperconductor
