Butterfly
From Memory Alpha, the free Star Trek reference
A butterfly was a variety of insect known for its colorful wings.
The SS Mariposa was named after the Spanish word for butterfly. (TNG: "Up The Long Ladder")
Female dancers seen on Rigel X ate butterflies as part of their act. (ENT: "Broken Bow")
The holographic baseball park program where Captain Benjamin Sisko trained the members of his baseball team, the Niners, in 2375, contained a simulation of a white butterfly that flew in the infield behind the pitcher's mound. (DS9: "Take Me Out to the Holosuite")
