Black triangle (UFO)

Black triangle and black triangle is the name of a class of unidentified flying objects with certain common characteristics. They have seen 40 years of the twentieth century (and possibly earlier) until today. Most often appear over cities in the U.S. and England , but also over other parts of the world, mass surveillance of St. Petersburg , Russia on 19 February 1997 .

In accordance with their name these unidentified flying objects are characterized by triangular (usually equilateral) and form massive black. Capable of standing motionless in one place in the air and move with very great speed from one position to another . Usually not issue any sound , but some witnesses tell of slightly buzzing   . Often have lights in the middle of the triangle or near its peaks.