Enter a clue or pattern or both:
The Clue
Book signatures (7 letter answer)
The Answer
OCTAVOS
Tags
Notes
The answer OCTAVOS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Book sizes
Definition
OCTAVO as a noun:
1. (octavo, eightvo, 8vo) = the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves