Rule of three or Rule of Thirds may refer to:
Science and technology Rule of three (aeronautics), a rule of descent in aviation 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 (hematology), a rule of thumb to check if blood count results are correct Rule of three (mathematics), a method in arithmetic 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
Arts and entertainment Rule of three (writing), a principle of writing, storytelling, and rhetoric Rule of Three, a podcast by Jason Hazeley and Joel Morris 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 The Rule of Thirds, a 2008 album by Death In June Rule of 3, alternate title of Canadian 2019 TV movie All my husband's wives Rule of Three (film), an upcoming Temple Hill Entertainment horror film based on Sam Ripley's novel of the same name
Other uses Rule of threes (survival), a mnemonic for the priorities of survival Rule of Three (Wicca), a religious tenet Celebrity death rule of threes, a superstition regarding the deaths of celebrities
Variations Rule of thirds, a rule of thumb for composing visual images Rule of thirds (diving), a rule of thumb for divers Rule of thirds (military), a rule of thumb in military planning
See also
Three-sigma rule, for a normal distribution in statistics Triumvirate, a political regime dominated by three powerful individuals