Triangulum, meaning 'triangle', is a small constellation located in the northern sky near the Andromeda constellation.
Unlike many constellations, this one doesn't need knowledge of ancient Greek myths to understand its meaning. It looks like a triangle!
Technically you don't need any equipment at all to see Triangulum! However, to see the fainter stars in the constellation, especially from a light-polluted location would require a good pair of binoculars.