Back in the early days of space travel, personnel assigned to starships wore assignment patches to designate the space station or vessel they served aboard. In the days of Captain James T. Kirk, Constitution-class starship personnel still had their own unique logos, although, by that point, they were worn as insignia on duty uniforms -- over the left breast -- where Starfleet personnel now wear their combadges.
Starfleet has since done away with assignment patches and ship-specific uniform insignia, however, most Starfleet vessels do still have their own unique service logos. These logos are a source of pride for the crew, and are usually displayed prominently throughout the ship.
The USS Enterprise-D has its own service logo. As you’ll note in the image, the Enterprise-D service logo consists of a top-down silhouette of a Galaxy-class starship, with the starboard (right) side of the saucer adapted to look like the letter “D”. It presents a simple ID image that may become iconic as the Enterprise builds a reputation for itself in the years to come.
-Lieutenant Sam Archer
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February 8, 2363 -- (Original Devron Timeline // Devron Timeline w/ Temporal War Reset)
(Devron Timeline 3.0 // Devron Prime Timeline)