Quarks and gluons and partons, oh my …

The proton consists of a complex mixture of quarks and gluons. Physicists use the word parton to describe all constituents of a proton.

Quarks and gluons are more generically called “partons.”

http://news.fnal.gov/2012/05/quarks-and-gluons-and-partons-oh-my/, by Don Lincoln.