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What is a point source?

What is a point source? Here are some definitions.

Noun
  1. (sciences) a source of pollution, radiation, waves, fluid or other substance that has one specific location (and negligible physical extent, distinguishing a point source from other source geometries). In simulations they can often be approximated using mathematical point sources.
  2. (mathematics) the abstract concept of a singularity emitting a flux or flow. A source with infinitesimal dimensions in space.
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Examples
Illuminance is the measurement of how bright a point source of light appears to the eye.
The results are consistent with the predictions of continuum elasticity theory for the strain of a point source subject to an applied force.
Shadows from a point source appear parallel when projected onto a flat surface.
The light used must come from a point source, the smaller and the more intense it is the better.
He also studied catacaustic curves in 1682, these being the envelope of light rays emitted from a point source after reflection from a given curve.
It uses a point source of monochromatic light at the focus of a quality lens.

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