Nit
A nit was the egg of a louse (alternatively pronounced Lice), a parasitic insect that lived on the skin of mammals and birds. The  term "picking nits" or "nitpicking" was commonly used by Humans to describe meticulously searching for and criticizing trivial errors in detail.

In 2365, Ensign Wesley Crusher was concerned that he was "picking nits" when he thought that Ensign Davies should have run an ico-spectrogram on the survey results on Drema IV. ()

In 2369, after Minister  asked a number of persnickety questions relating to the preparations for the Jeraddo energy transfer project, he apologized to Major Kira, asking her to forgive his "bureaucratic nit-picking". ()

The crew of the Federation starship Atlantis once suffered a devastating infestation of Kerplickian lice. To avoid the embarrassment of having lost a ship to lice, Starfleet Command neglected to record the details of the incident, such as that the official logs only showed that half the Atlantis crew suddenly disappeared without explanation. (LD: "Mugato, Gumato")

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