Black triangle
Black triangle may refer to one of the following:
- Black triangle (badge), a Nazi concentration camp badge worn by inmates deemed "asocial"
- Angularis nigra, triangular gap between teeth
- Black triangle (pharmacovigilance), suffixed to the trade name of British medicines when the drug is new on the market
- Black triangle (UFO), a type of UFO
- Black triangle, several code points in Unicode Geometric Shapes
Places
- Black Triangle (region), the nickname for one of Europe's most polluted areas, where Germany, Poland and the Czech Republic meet
- The nickname given to the area south of Montreal worst affected by a long term blackout during the North American ice storm of 1998
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