black triangle

== English == === Noun === black triangle (plural black triangles) (ufology) One of a class of triangle-shaped unidentified flying objects, usually with a light in each corner. 2005, Bill Foster, Peggy Foster, Nadine Wheeler, The Black Triangle Abduction, The Invisible College Press, page 22: Somewhere behind that blinking yellow light that black triangle was hovering, (or moving only a few miles per hour), in our direction, straight at us. Used other than figuratively or idiomatically: see black,‎ triangle.