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A quark was a type of subatomic particle which was displayed on a starship's sensor readings of subspace particle emissions.
Quarks were among the particles listed in the computer's subspace emission scan read out on the bridge station viewscreens of USS Voyager. (Star Trek: Voyager video playback set artwork)
The "subspace emission scan 247" screen was a computer graphic artwork played continuously on some monitors on the set of Star Trek: Voyager, aboard Voyager and probably many other starships of the same era. The screen is reproduced legibly in Stephen Edward Poe's A Vision of the Future - Star Trek: Voyager companion book.