The term 'Cyclotron Particle' refers to an ATOM or ION that has been accelerated in a cyclotron, a type of particle accelerator. An ATOM is a basic unit of matter composed of a nucleus surrounded by electrons, while an ION is an ATOM or molecule with a net electric charge due to the loss or gain of one or more electrons. The cyclotron accelerates these particles to high speeds, allowing them to be used for various scientific and medical purposes.