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Other sizes occasionally used are called “sixteenmo” or “sextodecimo,” “eighteenmo” or “octodecimo,” etc.

The fineness of the new type, as has been suggested, called for a smaller size of book, which was also favored by considerations of economy and convenience; and so Aldus made up his sheets in a form which the fold compels us to call octavo, but which to-day would be called sixteenmo.

Books and their Makers during the Middle Ages": "The Elzevirs, following the example set a century and a half earlier by Aldus, but since that time very generally lost sight of by the later publishers, initiated a number of series of books in small and convenient forms, twelvemo and sixteenmo, which were offered to book buyers at prices considerably lower than those they had been in the habit of paying for similar material printed in folio, quarto, or octavo....

The printed page is relatively wide, and the whole effect of the book is that of a tiny quarto, though in reality the dimensions are those of a rather small sixteenmo of normal proportions.

The mention of any size, folio, quarto, octavo, twelvemo, sixteenmo, calls up at once a distinct mental picture of an ideal book for each dimension, and the series is marked by a decreasing thickness of paper and size of type as it progresses downward from the folio.