Wikipedia said:The uniform blackness of this flag is representative of the negation of all oppressive structures, in deliberate contrast to the colourful flags typical of most nation-states. Additionally, as a white flag is the universal symbol for surrender to superior force – , the black flag is a symbol of defiance, an opposition to surrender.
Everyone seems to like so far what I've posted, so I've decided to share more. I've never really liked the Firaxis graphics for the unknown/random civilizations, so I decided to make a replacement that could capture the idea of an unknown civilization in modern times.
Hoist the Black Flag!