SM

Sand Man

i think of this Sandman~
http://static.comicvine.com/uploads/...9-morpheus.jpg

but, back to counting....

SN

...SiN

I've never read the comic book, but that guy popped up first when I was looking for images xD

SO

...so

i love Sandman, i have his comic book series. =)

SP

SPecific...

SQ

Sound Quality

SR

So Real

SS

I don't remember, but I think I learned about something called an "SS" somewhere...
-google search-
Oh, the Hitler Schutzstaffel.

yep.

ST

Street

SU

Spinning Uranus

SV

SW

SWeets

SX

SY

SZ...

TA!!!

TB

tuberculosis?