"Black triangle"@en . . "Belgium"@en . "May be the F-117A Nighthawk"@en . "The Black triangle is a UFO reported to be first seen over Belgium in 1989. Black triangles are a Unidentified Flying Objects (UFO) with several similarities. They have appeared more commonly over cities of the United States and England, but have been spotted worldwide, including a mass sighting over St. Petersburg, Russia on February 19, 1997."@en . . "Black triangle"@en . "1989-11-28"^^ . . . . . "The Black triangle is a UFO reported to be first seen over Belgium in 1989. Black triangles are a Unidentified Flying Objects (UFO) with several similarities. They have appeared more commonly over cities of the United States and England, but have been spotted worldwide, including a mass sighting over St. Petersburg, Russia on February 19, 1997."@en . "Triangular, three-dimensional"@en . "Lights are at the tips of each end"@en . .