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Rule of three

name

Proper Noun

1
A rule stating that, if two ratios are equal, then the denominator of the second equals its numerator times the reciprocal of the first ratio: if a/b=c/d then d=(bc)/a.
2
A religious tenet held by some Wiccans, stating that whatever energy, positive or negative, a person puts into the world will be returned threefold.
3
A rule for clinical trials used for determining the rate of adverse side effects when no such side effects present during the course of the trial.
4
A rule which states that things which come in groups of three are inherently funnier or more effective than things which come in groups of other sizes. rhetoric
5
A rule which states that things which come in groups of three are inherently funnier or more effective than things which come in groups of other sizes.; Specifically, the technique of having a setup in advance, a reminder to keep it fresh in the audience's memory, and then a payoff. rhetoric

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6
A religious tenet stating that the energy a person puts out into the world, positive or negative, will be returned to that person threefold.
7
A rule of thumb in the C++ programming language, stating that any class that defines a destructor, a copy constructor, or a copy assignment operator should define all three of them.

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