Just a different perspective here:

The black triangle is a lesbian or feminist symbol of pride and solidarity. The symbol originates from Nazi concentration camps, where every prisoner had to wear one of the Nazi concentration camp badges on their jacket, the colour of which categorised them according "their kind". Individuals deemed "asocial" had to wear the black triangle. In the Nazis' meticulous records there is no word of the black triangle having been imposed on lesbians, or of lesbians as a group being confined to concentration camps. Whatever the reason, lesbians have over time claimed the black triangle as a symbol of defiance against repression and discrimination, and it is considered a counterpart to the Gay Pink Triangle.

https://commons.wikimedia.org/wiki/File:Black_triangle.svg