Hypothetical Matter

A tachyon is a hypothetical particle that moves at superliminal speeds.
A gauge boson always travels at the speed of light, e.g., gluons and photons.
That regulates the rest of the known matter in the universe to a class of particles known as tardyons - subliminal speeds.

Are there any hypotheses that suggest the existence of a particle that DOES NOT move?

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Also, the code for this filters out all URLs. Is there some way to make this be able to filter out only the colon and ONE forward slash? That would make this perfect. Thanks.