Standard Address Number. A unique identification code for each address of each organization in or served by the book industry. This includes book publishers, book wholesalers, book distributors, book retailers, college bookstores, libraries, library binders, and serial vendors. The SAN serves to facilitate such activities as purchasing, billing, shipping, receiving, paying, crediting, and refunding. Assignment of code numbers is centrally administered by the R. R. Bowker Company.