The term Tetrahedron refers to a region that predates the Republic; it was eventually called the Arrowhead. This area encompassed several of the Galactic Republic's original worlds, such as Corellia, Coruscant, and Duro. The name originated from a Duros physicist specializing in hyperspatial theory, who posited that Alderaan, Coruscant, and Corellia, together with the Ginn Jump, formed the four points of an ideal pyramid shape.
During 1 BBY, Doctor Insmot Bowen of the Obroan Institute for Archaeology, a specialist in the pre-Republic era, referenced the Humans of the Tetrahedron. This occurred during a discussion with Bevel Lemelisk, Admiral Conan Antonio Motti, and General Arhul Kurumenga, suggesting the name was still used when discussing past events.