What are some instances of Star Wars and Star Trek acknowledging each other’s existence? Like a red shirt in Star Wars or Spock mentioning an event on Tattooine?

There are a few instances of Star Wars and Star Trek acknowledging each other’s existence. In the Star Wars universe, there is a planet called Tattooine which is home to both Luke Skywalker and Darth Vader. In the Star Trek universe, Spock mentions an event that took place on Tattooine in one of the episodes.