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'Rule of three' may refer to:

★ Rule of three (Wiccan), a tenet of Wicca

★ Rule of three (mathematics), a computation method in mathematics

★ Rule of three (writing), a principle of writing

★ Rule of three (play), a series of one-act plays by Agatha Christie

★ Rule of three (aviation), a rule of descent in aviation:

★ Rule of three (C++ programming), a rule of thumb that says that if a class has one of the following - destructor, copy constructor, assignment operator - it probably needs all three.

★ ''Rule of three'' (slang), the generalization that conversing men multiply their true number of sexual encounters by three in order to boast, while conversing women divide their true number of sexual encounters by three in order to fulfill societal expectations of female propriety.
It may also refer to:

★ Rule of thirds, a compositional rule of thumb in photography