The "S" stands for "S"...and the "C" well it stands for "C" and "SC" stands for "SC". When used with 911 it stands for SC also as in 911SC. 
I think it meant nothing in 1978 but when Porsche updated the web page as referenced above (2003) it became "Super Carrerra". 
It doesn't matter, in three months this thread will be buried and someone else will ask the same question. 
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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