About Nexon's filter...

For some weird reason, ''c8'' is filtered aswell. o_O

http://en.wikipedia.org/wiki/C8_Rifle
http://en.wikipedia.org/wiki/C-8_Buffalo
http://en.wikipedia.org/wiki/Saturn_C-8
http://en.wikipedia.org/wiki/HMS_C8
http://en.wikipedia.org/wiki/USS_Raleigh_(C-8)

I think it's also an explosive. :x
(remembers seeing it in that one game with all the falling sands, it would burn if caught on fire. xD)

For the record, this is older than most of the content we have. D:

Edit~
Found one of he many links to it. :x
http://www.fallingsandgame.com/sand/pyro.html
Nevermind, it was c-4. xD