A triangular pyramid.
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Triangular Prism
There is no 3D shape with 6 faces: 4 rectangles and 2 triangles. See the link for all forms of hexahedra.
A cuboid.
Cuboid
cube
A butt
A 3D shape with all triangular faces can be a tetrahedron pyramid.
a hexagonal prism
An icosahedron.
In its most general form, a parallelepiped.
A cuboid.