This is the dagger as seen in Mirror Mirror, a 1966 season 2 episode of Star Trek. It is one of the most famous episodes of the original series, and is remembered by fans more than 55 years after it aired.
Spock, Sulu, Chekov and others have all been turned into mean-spirited, Roman-saluting, power-usurping Machiavellians bent on annihilating planets and disciplining subordinates with pain-inducing agonizers. You know that Spock is evil the minute you see his goatee.
The Enterprise crew wear this knife on their hip as part of their alternate universe uniform (see attached ...
