Pink triangle and the LGBT rights movement. In Nazi concentration camps, each prisoner was required to wear a downward-pointing, equilateral triangular cloth badge on their chest, the color of which identified the reason for their imprisonment. Early on, homosexual male prisoners were variously identified with a green triangle (indicating criminals) or red triangle (political prisoners), the number "175" (referring to Paragraph 175, the section of the German penal code criminalizing homosexual activity), or the letter "A" (which stood for "Arschficker", literally "ass fucker"). Later, the use of a pink triangle was established for prisoners identified as homosexual men, which also included bisexual
Black triangle (badge) and Sinti people, and others. Many black triangle prisoners were mentally disabled or mentally ill. Nazis considered homosexual women asocial and a threat to German society, and the badge was used to identify them. In the 1970s, the black triangle was first used as a symbol of pride and solidarity by lesbians in the United Kingdom; and its symbolic use was introduced in North America through the "women's peace camp movement". It has also been adopted in remembrance of lesbians who suffered and died at the hands of Nazis. Some lesbians wear it for "historical precision". Some UK groups concerned