Rule of three or Rule of Thirds may refer to:
Science and technology
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Rule of three (aeronautics)
In aviation, the rule of three or "3:1 rule of descent" is a rule of thumb that of travel should be allowed for every of descent. For example, a descent from flight level
In aviation and aviation meteorology, a flight level (FL) is an aircra ...
, a rule of descent in aviation
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Rule of three (C++ programming) The rule of three and rule of five are rules of thumb in C++ for the building of exception-safe code and for formalizing rules on resource management. The rules prescribe how the default members of a class should be used to achieve these goals sys ...
, a rule of thumb about class method definitions
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Rule of three (computer programming)
Rule of three (''"Three strikes and you refactor"'') is a code refactoring rule of thumb to decide when similar pieces of code should be refactored to avoid duplication. It states that two instances of similar code do not require refactoring, but ...
, a rule of thumb about code refactoring
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Rule of three (hematology)
A complete blood count (CBC), also known as a full blood count (FBC), is a set of medical laboratory tests that provide information about the cells in a person's blood. The CBC indicates the counts of white blood cells, red blood cells and plat ...
, a rule of thumb to check if blood count results are correct
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Rule of three (mathematics), a method in arithmetic
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Rule of three (medicinal chemistry) 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 for lead-like compounds
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Rule of three (statistics)
In statistical analysis, the rule of three states that if a certain event did not occur in a sample with subjects, the interval from 0 to 3/ is a 95% confidence interval for the rate of occurrences in the population. When is greater than 30, t ...
, for calculating a confidence limit when no events have been observed
Arts and entertainment
* ''Rule of Three'', a podcast by
Jason Hazeley and Joel Morris Jason Hazeley and Joel Morris are a British comedy writing duo. Their work includes a collection of parody Ladybird books, and they have written scripts for many British comedy series and films, including ''That Mitchell and Webb Look'', Charlie Bro ...
* ''Rule of Three'', a series of one-act plays
by Agatha Christie
* The Bellman's Rule of Three in ''
The Hunting of the Snark
''The Hunting of the Snark'', subtitled ''An Agony in 8 Fits'', is a poem by the English writer Lewis Carroll. It is typically categorised as a nonsense poem. Written between 1874 and 1876, it borrows the setting, some creatures, and eight por ...
'', a poem by Lewis Carroll
* ''
The Rule of Thirds'', a 2008 album by Death In June
Other
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Rule of threes (survival)
In survival, the rule of threes involves the priorities in order to survive. The rule, depending on the place where one lives, may allow people to effectively prepare for emergencies and determine decision-making in case of injury or danger posed ...
, the priorities in order to survive
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Rule of Three (Wicca), a religious tenet
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Rule of three (writing)
The rule of three is a writing principle that suggests that a trio of entities such as events or characters is more humorous, satisfying, or effective than other numbers. The audience of this form of text is also thereby more likely to remember ...
, a principle of writing, and of rhetoric
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Rule of thirds
The rule of thirds is a "rule of thumb" for composing visual arts, visual images such as designs, films, paintings, and photography, photographs.
The guideline proposes that an image should be imagined as divided into nine equal parts by two equa ...
, a rule of thumb for composing visual images
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Rule of thirds (diving)
In scuba diving, the rule of thirds is a rule of thumb used by divers to plan dives so they have enough breathing gas remaining in their diving cylinder at the end of the dive to be able to complete the dive safely. This rule generally only applie ...
, a rule of thumb for divers
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Rule of thirds (military)
The rule of thirds is a rule of thumb used when planning for the deployment and usage of a military organization , according to which one third of the total military forces involved should be available for operations, one third should be prepari ...
, a rule of thumb in military planning
See also
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Three-sigma rule, for a normal distribution in statistics
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Triumvirate, a political regime dominated by three powerful individuals
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