Feather

Feathers were produced by avian species, such as crows and ravens, for protection, display, and flight. Humans also used feathers for various purposes.

Deputy Sheriff Bennings, a Human descendant on the Skagaran colony, decorated his hat with a few black feathers. .

The Romulan Birds-of-Prey had a bold pattern of an alien bird's feathers painted on the ship's ventral hull when the USS Enterprise (NCC-1701) encountered one in 2266 near the Romulan Neutral Zone. 

Sylvia used the phrase "like feathers in the wind" to describe the helpless aliens after Kirk had smashed her transmuter. 

Trelane had a stuffed birdlike creature covered in feathers in his mansion. 

The Aurelians were a bipedal, avian race. They stood taller than most Humans, and had bright yellow feathers. 

Quetzalcoatl was a feathered-serpent deity worshiped in Mesoamerica, usually associated with or equated with to Kukulkan. 

The Skorr were an avian race with what appeared to be feathered wings. 

When Deanna Troi brought a local costume from Angel I for William T. Riker and asked if he was "going to put that thing on and parade around like one of them?", Riker responded by telling her that on Kabatris, he had to wear furs and on Armus IX, he wore feathers. 

One of the opponents in Worf's Klingon calisthenics program was covered in feathers. 

Jean-Luc Picard was given a hat with a feather in it when Q put the crew of the USS Enterprise (NCC-1701-D) into a situation where they became Robin Hood and his Merry Men. 

The tympanic tickle is likely a type of sexual act Ferengi can perform on one another, where the tympanic membrane is stimulated with the help of a feather. When performed by an amateur the feather can get stuck and medical attention is needed to remove it. 

The game of darts appealed to Miles O'Brien because, as he told Quark, it involved "No lasers, no holograms; just steel tips and feathers."

A dream catcher was often decorated with feathers. 

In 2374, after Seven of Nine abruptly left USS Voyager, Janeway found a passage in Seven's logs reading "The feathers are black... wingspan approximately one and a half meters... the eyes are yellow..."

When Harry Kim and B'Elanna Torres found themselves in Viorsa's virtual reality program, a little woman brushed Kim's head with a feather duster in a mock-ceremonial manner. 

The Baneans had distinctive forehead ridges similar to the combs of some species of Earth birds, and feather-like structures around their faces and on their brows. 

The hull of the was marked by distinctive "feather" shaped plating. 

Background
A Vulcan statue, featured in the Star Trek: Enterprise episode holds a feather in its right hand. This item was sold off on the It's A Wrap! sale and auction on eBay.