The one above is far from the only one, heck it’s far from being the only variant of that one! For a quick refresher, the video below goes through the most significant changes over the years.
http://www.youtube.com/watch?v=wgLVLRStLhc
There’s much more to it than that however. The (almost but not really shocking) fact that I learned was that the swooshing star above was not invented by the H-B studio, rather it already existed as the logo for the parent company, Taft Broadcasting.
The history of H-B logos is so rich that you’ll want to mosey on over to the rather fascinating Closing Logos website and read the (very) comprehensive overview of Hanna-Barbera logos down through the years, replete with when they were used, what shows they were used on as well as any and all variants used. It is certainly worthy of a few minutes of your time that I’m sure you can spare, so