What is the usual symbol for neutron?

Neutron:

• A neutron is a neutral subatomic particle discovered by James Chadwick in the year 1932.
• Every atom consists of three subatomic particles, electron, proton, and neutron.
• A nucleus contains protons and neutrons, and they are collectively called nucleons. Each nucleus is surrounded by number of electrons.
• Neutron is generally represented as ${\mathrm{n}}^0$ as they are electrically neutral.
• The mass of a neutron is approximately equal to $1.674\times {10}^{-27}\mathrm{kg}$