Receptor: 1. In cell biology, a structure on the surface of a cell (or inside a cell) that selectively receives and binds a specific substance. There are many receptors.
The most common is EPNS (Electro Plated Nickel Silver) but many other symbols are used: 1  EPBM (Electro Plated Britannia Metal). 2  EPCA (Electro Plated Copper Alloy). 3  ESM (Electro Plated Silver Mounts).he most common is EPNS (Electro Plated Nickel Silver) but many other symbols are used: 1  EPBM (Electro Plated Britannia Metal). 2  EPCA (Electro Plated Copper Alloy). 3  ESM (Electro Plated Silver Mounts).
Hi, Bob. This article should answer your question: http://www.examiner.com/article/what-does-epns-mean-on-my-silver-pieces. It will link to other articles that might interest you.- Code letters on silver plate pieces: http://www.examiner.com/sterling-silver-in-national/what-does-this-mean-on-my-fl. -- The Rogers silver companies: http://www.examiner.com/sterling-silver-in-national/rogers-the-silver-industry. VALUE OF STERLING AND SILVER PLATE PIECES.