Playfair may refer to: * Playfair (surname) * Playfair (lunar crater) * Playfair (Martian crater) * PlayFair, software that removes Apple's FairPlay DRM file encryption, now succeeded by

Hymn A hymn is a type of song, and partially synonymous with devotional song, specifically written for the purpose of adoration or prayer, and typically addressed to a deity or deities, or to a prominent figure or personification. The word ''hymn'' d ...

* Playfair Project * TS ''Playfair'', a Canadian sail training vessel *

Playfair's axiom In geometry, Playfair's axiom is an axiom that can be used instead of the fifth postulate of Euclid (the parallel postulate In geometry, the parallel postulate is the fifth postulate in Euclid's ''Elements'' and a distinctive axiom in Euclidea ...

named after John Playfair * Playfair cipher, a manual encryption technique invented in 1854 by Charles Wheatstone * Playfair Cricket Annual * Playfair Race Course * Lyon Playfair Library, now called the Abdus Salam Library, at Imperial College London *'' Play Fair!'', an HIV/AIDS brochure

See also