An article shared by President Trump featured an upside-down pink triangle, crossed out by a red "no" symbol. Why LGBTQ+ and Jewish advocates are alarmed.

The pink triangle was used by LGBTQ+ activists as early as the 1960s, but it became more widely adopted during the 1980s as a symbol of resistance in response to the AIDs epidemic.

'San Francisco's Pink Triangle is a powerful symbol of our city's commitment to supporting LGBT rights and commemorates victims of the past,' police said.

Recommended video “The inverted red triangle is a symbol literally used by Hamas to mark targets before they are struck,” Spadina-Fort York MP Kevin Vuong told The Toronto Sun.

The pink triangle symbol was later reclaimed by the queer community, in particular during the AIDS epidemic, when it was was changed to face upward for the “Silence = Death” Project.

An article shared by President Trump featured an upside-down pink triangle, crossed out by a red "no" symbol. Why LGBTQ+ and Jewish advocates are alarmed.

But LGBTQ+ Jewish non-profit organization Keshet told USA TODAY it was "horrified" to learn about Trump's post. Here's what to know about the symbol's history. 'Hell to pay': Trump issues 'last ...