Sonic the Hedgehog 3.
http://info.sonicretro.org/Knuckles_the_Echidna#Miscellaneous
Found another site saying the crescent was inspired by the Nike logo: http://bit.ly/ZZSDLU
 

Sonic the Hedgehog 3.

http://info.sonicretro.org/Knuckles_the_Echidna#Miscellaneous

Found another site saying the crescent was inspired by the Nike logo: http://bit.ly/ZZSDLU