3D Face

3D Face 

3DFACE creates a three- or four-sided surface anywhere in 3D
space. You can specify different Z coordinates for each corner point
of a 3D face. 3DFACE differs from SOLID, which creates a threeor
four-sided surface that is parallel to the current UCS and can be
extruded.
With 3DFACE, you control which edges of a 3D face are visible,
allowing accurate modeling of objects with holes. Entering i or
invisible before the first point of an edge makes the edge invisible.
1. Choose Draw, Surfaces, 3D Face.
or
2. Type 3DFACE at the command prompt.
Command: 3dface
First point: pick
Second point: pick
Third point: pick
Fourth point: pick
Third point: enter