Existon

Description
An existon is a hypothetical fundamental particle at which there can be no smaller particles. Like objects can be broken down into molecules, a similar process repeats for molecules that can be broken down into atoms, and atoms into subatomic particles until we reach the elementary particles of physics. An existon is an abstract term for the smallest particle, whether it be elementary particles, preons or an infinitely recursive chain of smaller constituents. In the case where any particle can be divided again and again, the existon then takes the form of an infinitesimally small particle (which is infinitely small).