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
9-j symbol diagonal as well as even permutations of its rows or columns: An odd permutation of rows or columns yields a phase factor formula_27, where For example: The 9-"j" symbols can be calculated as sums over triple-products of 6-"j" symbols where the summation extends over all admitted by the triangle conditions in the factors: When formula_31 the 9-"j" symbol is proportional to a 6-j symbol: The 9-"j" symbols satisfy this orthogonality relation: The "triangular delta" is equal to 1 when the triad ("j", "j", "j") satisfies the triangle conditions, and zero otherwise. The 6-j symbol is the first representative, , of