Bibliographic format

Oversimplifying greatly, bibliographic format refers to the relationship between a full sheet of paper and the size and orientation of the leaf or leaves of the end product. For example, a text printed two-up so that the sheet of paper needs to be folded once to make the leaves of a book is in "folio" format. Printed four-up to be folded twice is a "quarto" and so on.

There are many names and abbreviations for bibliographic formats, some of which are given here:

DCRM(B)	Gaskell	Ordinary spoken English	Latinate spoken English	Other
full-sheet	1⁰	broadsheet, full sheet
fol.	2⁰	folio	folio	fo., 1/2⁰, f⁰, F
4to	4⁰	quarto	quarto	1/4⁰, Q⁰, Q
8vo	8⁰	octavo	octavo	1/8⁰, O
12mo	12⁰	twelvemo	duodecimo	1/12⁰, D
long 12mo	long 12⁰	long twelvmo	long duodecimo
16mo	16⁰	sixteenmo	sextodecimo	1/16⁰, S
18mo	18⁰	eighteenmo	octodecimo	1/18⁰, T
24mo	24⁰	twenty-fourmo	vicesimo-quarto	1/24⁰
long 24mo	long 24⁰	long twenty-fourmo	long vicesimo-quarto
32mo	32⁰	thirty-twomo	trigesimo-secundo	1/32⁰, Tt
48mo	48⁰	forty-eightmo	quadragesimo-octavo	Fe
64mo	64⁰	sixty-fourmo	sexagesimo-quarto	1/64⁰, Sf
72mo	72⁰	seventy-twomo
96mo	96⁰	ninety-sixmo
128mo	128⁰	hundred-and-twenty-eightmo

References