thumb indexes

Alphabet edge cuts

Thumb indexes are semicircular notches cut into the fore edge of a book's pages, each labeled with a letter or section name, allowing readers to flip directly to a desired part.

Common in dictionaries, encyclopedias, and Bibles: The dictionary's thumb indexes made it easy to jump straight to the M's.

The singular refers to one such notch or to the system as a whole.

Related

flip through · dictionaries · encyclopedias · cutouts · tabs · die-cutting · browse · easy access · atlases · pagination · sections · gilding · guides · cross-references · margins · gold leaf · navigation · edges

Opposites
navigation method

thumb indexesbookmarks

Reading position indicators

dog-earing · dog-eared pages · table of contents · sticky notes · paper clips

navigation ease/precision

thumb indexesscrolling

Moving display content vertically

Family

thumb, index, thumbs, indexes, indices, indexed, indexing, indexer, thumbed

Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Concrete · Rated G