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Black triangle may refer to one of the following:

• Black triangle (pharmacology), suffixed to the trade name of a British medicine indicates the drug (or its mode of use) is new
• Black triangle (badge), a Nazi concentration camp badge worn by inmates deemed "asocial"
• Black triangle symbol of lesbian or feminist pride and solidarity, which may have originated from the Black triangle (badge) of Nazi Germany
• Black triangle (UFO), a type of UFO sighting; the UFO being like a black triangle
• Black triangle, in Unicode Geometric Shapes (eg: ▼ ◀ ◣) special code for printing a variety of shapes including various black triangles
• The nickname given to the triangular area south of Montreal worst affected by a long term blackout during the North American ice storm of 1998
• The nickname for one of Europe's most polluted areas- the area where Germany, Poland and the Czech Republic meet. [1]

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