12º

Noun

 * 1)  Abbreviation of duodecimo, a page size (5"-5.5" x 7.125"-7.5")
 * 2)  Abbreviation of duodecimo, a book size using duodecimo-sized pages.

Synonyms

 * 12mo, twelvemo, duodecimo
 * D, 12mo, twelvemo, duodecimo

Adjective

 * 1) twelfth