A red triangle was once a common sight at Nazi ... on "organized hate" and were a "banned hate group's symbol," an upside-down red triangle. The symbol is not listed in the Anti-Defamation ...

Trump posted a link to an article, which displayed a preview of the featured illustration of an upside-down pink triangle with a red slash through it. It was not clear whether he read the article ...

With the Cold War heating up, the U.S. government set up hundreds of research sites ... to RADC and bolted upside down atop 30-to-50-foot pedestals in the middle of the triangle.