Linked from
The 14 pages that link to Antiproton, each with the reason it gives.
ProtonCompared with: Its negative charge distinguishes it from the positively charged proton.
PositronRelated: It is another common antiparticle, but unlike the positron it is composite.
AntiquarkBroader topic: It is the familiar baryon built from three antiquarks.
AntihydrogenRelated: It supplies antihydrogen’s nucleus and must be combined with a positron.
BevatronBroader topic: Bevatron experiments established the antiproton's existence in 1955.
AntineutronRelated: Like the antineutron, it is an antibaryon made of antiquarks.