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Shelf dummy
From LISWiki
A piece of wood, cardboard, or plastic in the shape of a book placed on a shelf in a library which bears a label indicating where a specific book, shelved out of the normal sequence, is located. Shelf dummies are often used in the reference stacks to indicate the location of books kept on the ready reference shelf, and in periodicals to indicate the location of back back files on microfilm or the Internet.