A red triangle was once a common sight at Nazi concentration camps, a part of history now thrust into the national spotlight by a banned political campaign ad.
Facebook moved Thursday to remove ads from President Donald Trump's reelection campaign that the company said violated its policies 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 League's database of symbols of hate and resembles an emoji that can be easily used. At particular issue currently: It may also be tied to antifa, an umbrella term for leftist militants.
In the historical context of Nazi concentration camps, however, the meaning of the symbol is well-documented.
Prisoners in concentration camps were identified using a system of symbols, according to the United States Holocaust Memorial Museum. The practice of using triangles in that system started in the late 1930s, according to the