Black triangles are a class of unidentified flying objects (UFOs) with certain common features which have reportedly been observed from the 1940s to the present. Media reports of black triangles originally came from the United States and United Kingdom, but phenomena consistent with these reports have been reported as exceptional occurrences throughout recorded history, using the language of the times.
Reports generally describe this class of UFOs as enormous, silent, black triangular objects, hovering or slowly cruising at low altitudes over cities and highways, usually at night and making no attempt to evade detection. These objects are often described as having "running lights", either bright white lights or pulsing colored lights that appear at each corner of the triangle.
Unlike other reported types of UFOs, Triangle-class UFOs have been reported to be visible to radar, as was the case with the famous Belgian UFO wave. During these incidents, Two Belgian F-16s attempted to intercept the objects (getting a successful missile lock at two occasions) only to be outmaneuvered ; a key conclusion of the Project Condign report was that no attempt should be made on the part of civilian or RAF Air Defence aircraft to outmaneuver these objects except to place them astern to mitigate the risk of collision.
