Rule

Rule may mean:

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• Norm
• Law
• Morality
• Monastic rule, the basis upon which a monastic order is run.
• Theorem, in mathematics, something which is always true
• Rule of thumb, Heuristic, a rule that doesn't always apply, but that shows a tendency or probability
• Game mechanic, a rule to help govern a game
• Military rule
• Ruler, a straightedge used for measurement

Rule may also be:

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• To control a country, for example through a dictatorship or monarchy
• In the field of artificial intelligence, a database of rules can be used to govern the behavior of a system
• Rule engine
• The Rule, a soul/reggae band