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“triangulum”
An ancient constellation shaped like an equilateral form with three equal sides: Between the constellations Andromeda and Aries there is a Triangulum.
Triangulum is a small constellation in the northern sky. Its name is Latin for "triangle", derived from its three brightest stars, which form a long and narrow triangle. Known to the ancient Babylonians and Greeks, Triangulum was one of the 48 constellations listed by the 2nd century astronomer Ptolemy.