What are some canon myths that keep perpetuating in the collective headcanon of fans?

https://sh.itjust.works/post/883285

What are some canon myths that keep perpetuating in the collective headcanon of fans? - sh.itjust.works

Oh, here’s a biggie. That individual ships in TOS had their own unique insignia. That turned out to be a myth, despite being perpetuated on-screen by ENT: “In a Mirror, Darkly”.

It also led to a post of mine that was particularly controversial at the time.

The Starfleet Insignia Explained

No Star Trek symbol captures the eye or imagination quite like the delta.

Star Trek