Black triangle (UFO)
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Black triangles are UFOs reported as having a triangular shape and dark color, typically observed at night, described as large, silent, hovering, moving slowly, and displaying pulsating, colored light
Drawing of the Phoenix Lights, an example of a black triangle UFO sighting
Black project
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A black project is a highly classified, top-secret military or defense project that is not publicly acknowledged by a government.
Black triangle (UFO)
…Northrop TR-3A Black Manta is a speculative surveillance aircraft purported to belong to the United States Air Force and to have been developed under a black project. It was said to be a subsonic stealth spy plane with a flying wing design. It was alleged to have been used in the Gulf War to provide laser designation…
The Lockheed F-117 Nighthawk is an example of an American black project, with its existence being classified information throughout its design and manufacture, as well as for several years after its service commenced.
Northrop Grumman B-2 Spirit.