The image below illustrates various geometric features, each labeled with the relevant terminology:

 

 

See Also:

Nodes

Free Points

Lines

Faces

Surfaces

Fixed Points

Free Edges

Shared Edges

Suppressed Edges

Non-manifold Edges

Solids

Bounding Faces

Fin Faces

Full Partition Faces

CAD Cleanup Tolerance

Geometry Cleanup Tolerance

Geometry Feature Angle