What is a CC on a syringe?

A "cc" marking on a syringe is a marker to indicate the volume of the syringe when filled to that marker.

A "cc" is a cubic centimeter (cm3).

1 cc = 1 cm3 = 1 milliliter (or 1000 cc = 1 liter)

Answer

This is an aside...in the book MASH, there was a character named Private Boone. He didn't have a lot of education, so everyone thought he was a bit slow. Anyway, Private Boone was tasked to monitor fluid intake and output of the patients, and had to record his measurements in cc's. After he was recording one cc per day or maybe two for some of the patients, they asked him and found out Private Boone thought cc stood for "cup of coffee."