A related design that saw some work, but never made it to the prototype stage, was Dumbo.

Kites of related design are used for sailing, including speed-sailing.

It is used to describe three se-tenant postage stamps of related design that make up a complete single design.

A related design, often grouped with derringers since it fits no other standard classification, is the Semmerling pistol.

A closely related design is a coin snatching black box machine called "The Thing".

These controls and a closely related dual-relay design are still widely used in stand-alone applications, powered by lead-acid batteries.

Larsen - two related, but different Norwegian designs.

Another closely related design was addition of a dogtooth notch to the leading edge (Avro Arrow).

Stephen Kurtin also has a product based on what appears to be a related design called TruFocals.

More recently, it has become common to issue a group of stamps with related designs and the same denomination on the same day.