This Trump Facebook ad attacking Antifa uses an upside down red triangle that sure looks like a... *checks notes* Nazi concentration camp badge for "political prisoners, social democrats, socialists, communists and anarchists, rescuers of Jews, trade unionists, and Freemasons."
The other iterations of this ad use actual street sign imagery which makes the upside down red triangle even weirder: pic.twitter.com/HRiO7Ti7PT