There are several related but distinct notions of central product.

A related but different notion is a free abelian group.

A closely related notion uses the idea of covering space.

There is also a related notion of almost normal surface.

A closely related notion is the differential of a function.

A related notion is cloudlets, which has been viewed in different ways.

A related notion is that of an extreme long shot.

In the theory of schemes, a related notion is ample line bundle.

A related notion, plane strain, is often applicable to very thick members.

A related notion may lie behind the barbecue as well.