The dot left to the name indicates, that you can have only 1 "Darth Vader" in your fleet.

Rule Edit

Star Wars Armada includes many famous characters and ships from the Star Wars universe. Each of these famous figures is represented by a card with a unique name, which is identified by a bullet (•) to the left of the name. A player cannot field two or more cards that share the same unique name.

Cards with Unique Edit