The story
From Triangulum, a constellation.
Etymology from Wiktionary, CC BY-SA 4.0.
Triangulum Galaxy
Today it means: A relatively nearby spiral galaxy in the Local Group, together with the Milky Way galaxy. It is at a distance of approximately 2.6 million light years from Earth, in the direction of the constellation Triangulum, and is also known as M33 and NGC 598. Full definition →