The sign/symbol/logo for the rock band Thirty Seconds to Mars. The image of a triangular shape with a horizontal line going through the centre of it. Also on the cover of their most recent album, This Is War. The band also had glyphs as their older symbols.
Person 1: Hey, look at this band's album cover, I bet they're into some sorta cult.
Person 2: That's Thirty Seconds to Mars, that's the triad, and, yes, this is a cult.