um.... an octagon....
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A 12 faced object or solid
A triangular pyramid, i.e. a pyramid with only 4 faces and each face a triangle, is called a tetra-hedron. this is because the word tetra-hedron (Greek in origin) has the following meaning: tetra = 4 hedron = faced so a tetrahedron is a four-faced object - the only four faced object is the triangular pyramid.
a four faced triangle is called a tetrahedron
A twelve sided polygon is called a dodecahedron. No, that is a twelve faced solid (3-D) object. A 12 sided polygon is a dodecagon.
an octagon * * * * * An octagon has 8 sides. An object with 8 faces is an octahedron.