Palestinian women walk past a graffiti of the Star of David under an inverted “red triangle,” a symbol that Hamas’ military wing, the Qassam Brigades, uses to identify Israeli targets in ...

One of the homes flying an inverted flag during that time was the residence of Supreme Court Justice Samuel A. Alito Jr., in Alexandria, Va., according to photographs and interviews with neighbors.

What is the symbol’s origin? Inverted triangles were used for a prisoner classification system in Nazi concentration camps during World War II. The triangles acted as quickly identifiable badges ...