C8

C8 stands for Club 8 (band) C8 stands for Castle Infinity

C7

C7 stands for Seventh Component of Complement C7 stands for Cervical Vertebra 7

C6S

C6S stands for Chondroitin-6-Sulphate C6S stands for Codeine-6-Sulfate (opiate)

C6h

C6h stands for Concentration at 6 Hours (drug research)