Before the pink triangle became a worldwide symbol of gay power and pride, it was intended as a badge of shame. In Nazi Germany, a downward-pointing pink triangle was sewn onto the shirts of gay men in concentration camps—to identify and further dehumanize them. It wasn’t until the 1970s that activists would reclaim the symbol as one of liberation.

Homosexuality was technically made illegal in Germany in 1871, but it was rarely enforced until the Nazi Party took power in 1933. As part of their mission to racially and culturally “purify” Germany, the Nazis arrested thousands of LGBT individuals, mostly gay men, whom they viewed as degenerate.

The United States Holocaust Memorial Museum estimates 100,000 gay men were arrested and between 5,000 and 15,000 were placed in concentration camps. Just as Jews were forced to identify themselves with yellow stars, gay men in concentration camps had to wear a large pink triangle. (Brown triangles were used for Romani people, red for political prisoners, green for criminals, blue for immigrants, purple for Jehovah's Witnesses and black for "asocial" people, including prostitutes and lesbians.)

Homosexual prisoners at the concentration camp at Sachsenhausen, Germany, wearing pink triangles on their uniforms on December 19, 1938. Corbis/Getty Images

At the camps, gay men were treated especially harshly, by guards and fellow prisoners alike. “There was no solidarity for the homosexual prisoners; they belonged to the lowest caste,” Pierre Seel, a gay Holocaust survivor, wrote in his memoir I, Pierre Seel, Deported Homosexual: A Memoir of Nazi Terror.

An estimated 65 percent of gay men in concentration camps died between 1933 and 1945. Even after World War II, both East and West Germany upheld the country’s anti-gay law, and many gays remained incarcerated until the early 1970s. (The law was not officially repealed until 1994.)

The early 1970s was also when the gay rights movement began to emerge in Germany. In 1972, The Men with the Pink Triangle, the first autobiography of a gay concentration camp survivor, was published. The next year, post-war Germany’s first gay rights organization, Homosexuelle Aktion Westberlin (HAW), reclaimed the pink triangle as a symbol of liberation.

“At its core, the pink triangle represented a piece of our German history that still needed to be dealt with,” Peter Hedenström, one of HAW’s founding members said in 2014.

Memorial plaques for homosexuals, Jehovah's Witnesses and Wehrmacht deserters are placed where once stood one of the demolished barracks in Buchenwald concentration camp near Weimar, Germany. Horacio Villalobos/Corbis/Getty Images

Afterwards, it began cropping up in other LGBT circles around the world. In 1986, six New York City activists created a poster with the words SILENCE = DEATH and a bright pink upward-facing triangle, meant to call attention to the AIDs crisis that was decimating populations of gay men across the country. The poster was soon adopted by the organization ACT UP and became a lasting symbol of the AIDS advocacy movement.

The triangle continues to figure prominently in imaging for various LGBT organizations and events. Since the 1990s, signs bearing a pink triangle enclosed in a green circle have been used as a symbol identifying “safe spaces” for queer people. There are pink triangle memorials in San Francisco and Sydney, which honor LGBT victims of the Holocaust. In 2018, for Pride Month, Nike released a collection of shoes featuring pink triangles.

Although the pink triangle has been reclaimed as an empowering symbol, it is ultimately a reminder to never forget the past—and to recognize the persecution LGBT people still face around the world.