Rule of three

Rule of three may refer to:

Science and technology

Rule of three (C++ programming), a rule of thumb about class method definitions
Rule of three (computer programming), a rule of thumb about code refactoring
Rule of three (mathematics), a method in arithmetics
Rule of three (medicinal chemistry), a rule of thumb for lead-like compounds
Rule of three (statistics), for calculating a confidence limit when no events have been observed

Rule of three (aviation), a rule of descent in aviation
Rule of three (economics), a rule of thumb about major competitors in a free market
Rule of threes (survival), a quick reference for how long one can survive in an emergency situation
Rule of Three (Wicca), a tenet of Wicca
Rule of three (writing), a principle of writing
Rule of Three, a series of one-act plays by Agatha Christie
The Bellman's Rule of Three in The Hunting of the Snark, a poem by Lewis Carroll

Three-sigma rule, for a normal distribution in statistics
Triumvirate, a political regime dominated by three powerful individuals
Rule of thirds, a compositional rule of thumb in photography
Rule of thirds (diving), a rule of thumb for scuba divers
Rule of thirds (military), a rule of thumb regarding the distribution of available manpower

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