# Rule of Three

Rule of Three

Rule of three may refer to:
*Rule of three (medicine), judgement of likelihood of harm in drug trials.
*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 (programming), a code refactoring rule of thumb.
*In survival skills, the rule of three is a rule of thumb for prioritizing needs

It may also refer to:
*Rule of thirds, a compositional rule of thumb in photography

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### Look at other dictionaries:

• Rule of three — Rule Rule, n. [OE. reule, riule, OF. riule, reule, F. r[ e]gle, fr. L. regula a ruler, rule, model, fr. regere, rectum, to lead straight, to direct. See {Right}, a., and cf. {Regular}.] 1. That which is prescribed or laid down as a guide for… …   The Collaborative International Dictionary of English

• Rule of three — Three Three, n. 1. The number greater by a unit than two; three units or objects. [1913 Webster] 2. A symbol representing three units, as 3 or iii. [1913 Webster] {Rule of three}. (Arith.) See under {Rule}, n. [1913 Webster] [1913 Webster] …   The Collaborative International Dictionary of English

• rule of three — n. Math. the method of finding the fourth term of a proportion when three terms are given: the product of the first and last terms is equal to the product of the second and third …   English World dictionary

• rule of three — a rule in mathematics: the product of the means in a proportion equals the product of the extremes used for finding the fourth term of a proportion where three are given * * * Math. the method of finding the fourth term in a proportion when three …   Useful english dictionary

• Rule of three (programming) — Rule of three is a code Refactoring rule of thumb to decide when a replicated piece of code should be replaced by a new procedure. It states that you are allowed to copy and paste the code once, but that when the same code is replicated three… …   Wikipedia

• Rule of Three (play) — Rule of Three is a set of three one act plays by British author and playwright Agatha Christie. It was first published in 1963. The three plays are entitled The Rats , Afternoon at the Seaside , and The Patient …   Wikipedia

• Rule of three (writing) — For other uses, see Rule of Three. The Three Bears The rule of three is a principle in writing that suggests that things that come in threes are inherently funnier, more satisfying, or more effective than other numbers of things. The… …   Wikipedia

• Rule of Three (Wiccan) — The Rule of Three (also threefold law or law of return) is a tenet of the Neopagan religion of Wicca. It claims that whatever energy a person puts out into the world, be it positive or negative, will be returned to that person three times.… …   Wikipedia

• Rule of three (C++ programming) — The rule of three (also known as the Law of The Big Three or The Big Three) is a rule of thumb in C++ that claims that if a class or struct defines one of the following it should probably explicitly define all threecite book last = Stroustrup… …   Wikipedia

• Rule of three (medicine) — The rule of three states that, if no major adverse events occurred in a clinical trial of a drug, then there can be 95% confidence that major adverse events do not happen more often than one in n/3 people, where n is the number of people in the… …   Wikipedia