What do you call a single proton with no electrons or neutrons?

Single protons that are not partnered with any electrons or neutrons are most commonly called "naked protons." A naked proton is the result of a hydrogen atom shedding it's electron once it reaches a gaseous state. Since hydrogen does not typically contain any neutrons, the release of the proton/electron bond leaves the proton as a free naked hydrogen nucleus, which is also referred to as H+. H+ protons can leap frog from acid to acid in its gaseous state, but is unable to do so in its liquid state due to the strength of the liquid positive and negative charges in hydrogen's respective protons and electrons. 
The reference link below explains the value of naked protons in regards to atomic research and H+'s quirky and interesting behavior once it is free from hydrogen's balanced atomic charge.
https://www.psc.edu/