What is the meaning of Open book?

Open book means Unmatched book.

Barry Goldsmith
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APABarry Goldsmith. (2010). open book. Retrieved September 21, 2026, from http://smartdefine.org/open_book/definitions/1159671
ChicagoBarry Goldsmith. 2010. "open book" http://smartdefine.org/open_book/definitions/1159671 (accessed September 21, 2026).
HarvardBarry Goldsmith 2010, open book, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/open_book/definitions/1159671>.
MLABarry Goldsmith. "open book" 21 October 2010. Web. 21 September 2026. <http://smartdefine.org/open_book/definitions/1159671>