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
Pink triangle in school. The pink triangle served as the basis for the "biangles", a symbol of bisexual identity which consists of pink and blue triangles overlapping in a lavender or purple area. The pink and blue symbolize either homosexuality and heterosexuality, or female and male gender, reflecting bisexuals' attraction to both. The symbol of the pink triangle has been included in numerous public monuments and memorials. In 1995, after a decade of campaigning for it, a pink triangle plaque was installed at the Dachau Memorial Museum to commemorate the suffering of gay men and lesbians. In 2015 a pink triangle was