30 doradus

The name 30 Doradus is used collectively for a bright nebula, commonly called the Tarantula nebula due to its similarity in appearance to the spider of that name, and the cluster of star embedded within it. The collective name comes from the fact that together they were first catalogued as a star.

http://www.jb.man.ac.uk/astronomy/nightsky/AList/Dorado.html