A pendant of Seth in his zoomorphic form, a cryptid known as the sha. He sits above the N1-sky hieroglyph, a rare but existant iconographic detail.
This "couchant" version differs from the recumbent one I also have in my shop in that his tail is up and at the ready. Usually a weapon of some variety or another (an arrow and mace being most common), my version of his tail features a forked end as seen on a wAs scepter.
If only passingly familiar with him, you can brush up with Henadology's entry as an excellent starting point