Thumb index
Introduction A dictionary with thumb indexes (on the right).A '''thumb index''', also called a '''cut-in index''' or an '''index notch''', is a round cut-out in the pages of dictionaries, encyclopedias, Bibles and other large religious books, and various sectioned, often alphabetic, reference works, used to locate entries starting at a particular letter or section. The individual notches are called '''thumb cuts'''.Several ways to achieve this indexing effect were invented and patented in the 1970s by Arthur S. Friedman, a printing engineer in New York.
See also * Index (publishing)
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