A decagon based pyramid.
It is a hendecahedron but that can take many shapes. A nonagon based prism, for example.
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The solid commonly called a dodecahedron is not a solid pyramid but the name simply means a solid shape with 12 faces and so, a pyramid on a 11-sided polygonal base will be a dodecahedron.
The name of a 11 sided polygon is Hendecagon.
The name of a 11 sided polygon is Hendecagon.
Hendecagon.
Hendecagon