The Triangle and the NileThere is not a lot of mythology associated with The Triangle. The Greeks referred to the constellation as Deltoton, because of its similarity to a Greek capital letter "D", that is, a delta. So the constellation became associated with the Nile Delta and Egypt.
The Triangle and SicilyBecause of its shape, the constellation was also associated with the island of Sicily, which is generally triangular in shape with three well defined promontories on its coastline. The island, according to one story, was portrayed the sky at the wish of the goddess Ceres, who begged this favor from the chief of the Roman gods, Jupiter.