Black triangle
An inverted black triangle has two unrelated meanings:
In the UK, the inverted black triangle is used to indicate a medicine under intense scrutiny.
An inverted black triangle is a lesbian or feminist symbol of pride and solidarity. It originates from Nazi Germany, where it was one of a number of inverted triangle insignia used in concentration camps to designate different prisoner categories. The black triangle denoted, as well as vagrants and Gypsies, women considered "anti-social" (i.e., a threat to Nazi family values) such as lesbians and prostitutes. As a symbol of lesbian pride it is considered the female counterpart to the pink triangle, which was a symbol for gay men. Today we see an inverted triangle often used as a lesbian or feminist symbol because the inversion represents fighting back against discrimination, as opposed to passive acceptance of "separate but equal" treatment.
Black triangles are a type of UFO that have apparently been sighted on numerous occasions across the world during the 1990s and 2000s. They manifest at night as vast, silent, low-flying black objects surrounded by flashing lights. No convincing explanation for the phenomenon has yet emerged, but there are suspicions that the triangles may be a form of secret US spying aircraft.
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