It is a hendecahedron.
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12-sided two dimensional shape: dodecagon12-sided three dimensional shape: dodecahedron
A five-sided 2-dimensional shape is a pentagon.
A decagon is the ten-sided polygon (two dimensional shape). A decahedron is a ten-sided thee-dimensional shape. A ten-sided die can also be called a pentagonal trapezohedron.
The name of an eleven sided geometric shape is a Hendecagon or endecagon.
'Object' Do you mean 'shape' or 'solid'. a 2-dimensional shape is an hexagon a 3-dimensional solid is a hexahedron.