What are the organizational letters on the edge of pages on an encyclopedia called?

Answers (2)

You mean the edge index? I don't think I've seen one in years.

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Encyclopedias are a thing of the past.

Some books have cutouts in the pages forming an alcove with the letter or title of the section printed inside. That is called a thumb index. Here is a picture of a bible indexed that way:
qph.fs.quoracdn.net/main-qimg-8a9faba3a7308218e5b52985248c3018-c

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