The black flag represents the absence of a flag, and thus stands in opposition to the very notion of nation-states. In that light, the flag can be seen as a rejection of the concept of representation, or the idea that any person or institution can adequately represent a group of individuals.
The uniform blackness of the flag is in stark contrast to the colorful flags typical of most nation-states. Additionally, as a white flag is the universal symbol for surrender to superior force, the counter-opposite black flag would logically be a symbol of defiance and opposition to surrender.
A.
Inglixland 