English: An Euler diagram showing the IAU Executive Committee conception of the relationship between objects in the Solar System.
The central star has been excluded. Also excluded are artificial satellites.

Cosmic dust found within the Solar System falls under two categories depicted here: Small Solar System bodies and natural satellites. If the dust is orbiting the Sun, as with zodiacal dust, then it fits with small solar system bodies, which have no lower limit defined. And if the dust is orbiting a body other than the Sun, as with the countless particles of Saturn's rings, then these fit with natural satellites, which also have no lower limit defined. This diagram could be further refined to show how moonlets and dust fall within the category of natural satellites, with a separate set of cosmic dust orbiting the Sun falling within the category of small Solar System bodies.