Trill insignia (24th century)
Trill history was the history of the Trill, the symbionts, and the planet Trill.
In 3191, Captain Michael Burnham searched through books on Trill history in a mindscape, (along with Betazed history and Mirror universe history,) believing it could be where Doctor Marina Derex had left a clue to the Progenitors technology given Jinaal Bix's involvement. Having found nothing, she realized she was looking in the wrong place. (DIS: "Labyrinths")