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11 nifty little visual details you never noticed in 'Star Trek'
Different Starfleet Ships Wore Different Uniform Badges - The iconic curved arrowhead shape of Starfleet as it is now a symbol for the entire franchise. However, initially the insignia was only primarily worn by Enterprise crew members. In the original series, each ship in Starfleet had a unique insignia. Take this preztel-like insignia worn by the USS Constellation crew members in The Doomsday Machine You can spot a different rectangular one worn by the USS Exeter crew in The Omega Glory.
USS Constellation (NCC-1017)
The USS Constellation (NCC-1017) was a Federation Constitution-class heavy cruiser in service to Starfleet in the 23rd century. (TOS episode: "The Doomsday Machine", ST reference: Star Trek Encyclopedia) In 2267, the vessel's service came to an abrupt end when the ship was destroyed by a planet-killing doomsday device. (TOS episode: "The Doomsday Machine")