Protons are subatomic particles with the symbol p or p+. They have a positive electric charge of 1 elementary charge. Questions referring to interactions of protons in solutions should rather use the acid-base tag.

Protons are subatomic particles with the symbol $p$ or $p^{+}$. They have a positive electric charge of 1 elementary charge.

The nucleus of every element consists of protons and the number of these protons are referred to as its atomic number. There are also neutrons present in the nucleus. Both are usually referred to as nucleons. The main mass of an atom (or ion) comes from these.

The term proton is also often used for the positively charged Hydrogen ion $\ce{{}^{1}H+}$.

A proton itself consists of two up quarks and one down quark and it is also a fermion.