Red
Red was one of the three primary colors. It could be associated with honor or prestige, in the case of a red carpet, for example.

Red was one of the colors chosen for the national flags of the United States, France, Germany, and Italy. ()

On Federation star charts of the 23rd century, 24th century, and 32nd century, the color red was used for Klingon territory and locations. (; ; )

The Stone of J'Kah was kept on a red pillow in a small box in the Vulcan monastery at P'Jem. ()

The 22nd century laser micrometer operated with a red light. ()

In the metaphorical language of the Tamarians, the individual Zinda was described as having red eyes. ()

On 23rd century Triskelion, Provider 1 was a red-colored disembodied brain. The thralls this being owned had red lights on their collars of obedience. ()

In 2268, a red light on Pavel Chekov's board signaled that either a hatch or a vent was not secured. Before the dikironium cloud creature entered the , there was a red light for a open hatch on the number two impulse engine. ()

Keiko O'Brien owned a red dress in 2371. ()

In 2371, Julian Bashir cautioned Kira Nerys not to replace the carpets in Deep Space 9's guest quarters for the visiting Yalosian ambassador with anything red or orange, as they didn't see that part of the color spectrum. ()

In 2372, Chief of operations Miles O'Brien told Worf that he looked good in red after Worf switched to the command division, becoming Deep Space 9's new strategic operations officer. ()

Young Annika Hansen's favorite color was red. In 2374, as a liberated Borg drone, Seven of Nine, she told Captain Kathryn Janeway this after Janeway had earlier mentioned Hansen's favorite color as being one of the things they didn't know about her yet. ()

Later that year, Harry Kim saw a dozen shades of red and  in the geological formations on a Y class planet. ()

In the 32nd century, the holographic bird alarm clock owned by Aditya Sahil would change its color daily, with red being one of the colors. In 3188, Michael Burnham described her friend Sylvia Tilly as having red hair. ()

See also 
 The Red Bolian
 Crimson
 Fuchsia red
 Martian red
 Red pillion dye

External link 
 
Colors