Sphenoid may refer to:
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Sphenoid bone, a bone in anatomy
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Sphenoid (geometry)
In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the ...
, a tetrahedron with 2-fold mirror or rotation symmetry
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