if it was meant to stand for side clicky, wouldn't 90% of their lineup have the SC designation? i suspect such an answer from ZL was made off the cuff but who knows.
Here are my favorites: Save the Children, StarCraft, Second Coming, Supreme Commander, Santa Claus, Supercharger, Schizophrenia, Spell Check, Sports Coupe, Section Chief,
Sacred Cow, Stepchild, Stray Cat, Spontaneous Combustion, Strike Commander, Systematic Chaos, Sweep and Clear, Stick and Click, Success Criteria