How the Nazi regime’s pink triangle symbol was repurposed for LGBTQ Pride.

Prisoners wearing pink triangles on their uniforms are marched outdoors by Nazi guards at the Sachsenhausen concentration camp in Germany on Dec. 19, 1938. CORBIS/Corbis—Getty Images

With LGBTQ Pride Month beginning June 1 — a month chosen to honor the history of activism epitomized by the Stonewall Riots of June 1969 — celebrants around the world will be getting ready for parades and other tributes. Symbols such as the rainbow flag and the pink triangle will abound; for example…