The term "Black Queen" has multiple meanings depending on its context.
In chess, a black queen is one of the pieces on the board and refers to any piece that represents the dark-colored female figure in the game. In this sense, it's simply part of the standard chess set up.
However, outside of the realm of chess, "Black Queen" can also refer to a powerful woman or an influential figure who is associated with darkness or evil. This usage often comes from literature and pop culture, where characters such as witches or villains may be referred to as black queens.
In summary, the phrase "black queen" has two meanings: one referring to a piece in a game of chess, while another refers to an influential figure associated with darkness or evil in literature and pop culture.