Deneb is part of several famous star patterns, which overlap each other. It’s the brightest of the stars composing the constellation Cygnus the Swan, where it marks the Swan’s Tail. When you hear ‘deneb’ in a star name, it always means ‘tail.’ Simultaneously, Deneb marks the head of an asterism (a readily recognizable grouping of stars that is not an official constellation), known as the Northern Cross. Plus it is one of the three stars known as the Summer Triangle . The other two stars are Vega and Altair . Deneb is the northernmost and dimmest of the three Triangle stars, but its association with the other bright stars makes it easy to identify.