Point particle
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A point particle is an idealized particle heavily used in physics. Its distinguishing features are that it does not have any volume or surface area; it is zero dimensional. A point particle is often a good approximation of real particles and also more extended bodies. In Newtonian gravitation as well as General relativity and Electromagnetism, the respective fields outside of a spherical object are identical to those of a point particle of equal charge/mass located at the center of the sphere.
Particle physics suggests that fundamental particles (quarks, electrons and other leptons) may be point particles which can contain mass, charge, spin, and multipole moments without occupying any volume.
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