NNP

Subsidiary Device.  A design element of secondary nature; not the main device on a numismatic or medallic object. While the principal design is called the device, some designs do have lesser elements, as seals, ornaments, adminicles, attributes or such; these are the subsidiary devices. Some British writers call this accessory symbol.

excerpted with permission from

An Encyclopedia of Coin and Medal Technology

For Artists, Makers, Collectors and Curators

COMPILED AND WRITTEN BY D. WAYNE JOHNSON

Roger W. Burdette, Editor