Jeremy: I'm guessing they are called coin tops because of their overall shape...
I think you're right. Thanks for the link.
Every Mars coin top in that gallery is truly a work of art. The overall proportions are elegant, and the decorative patterns exquisite. Spinning these in person under a variable-speed strobe would yield some spectacular visuals.
That said, "EDC" spinthings seem to be evolving away from the simple but elegant designs I tend to like. Still admire the impressive feats of fabrication and enjoy the exotic materials, though.