A rule is:

• In logic and mathematics:
  • Rule of inference, a scheme for constructing valid inferences.
  • Axiom, a statement which is either (1) assumed for the sake of a particular discussion, (2) commonly accepted, (3) definitive of a particular subject matter, (4) self-evident, or (5) otherwise taken for granted.
  • Theorem, a statement that is proved from axioms.

• In linguistics and computer science, a rewrite rule.

• Standard, a formal and widely-accepted statement, fact, definition, or qualification
• Operation, a determinate rule (method) for performing a mathematical operation and obtaining a certain result (Mathematics, Logic)
  • Unary operation
  • Binary operation
• Moral, an atomic element of a moral code for guiding choices in human behavior
• Heuristic, a quantized "rule" which shows a tendency or probability for successful function
• Ruleset, a group of rules in an ordered programme, for the purpose of governing a system (artificial intelligence, game mechanics)
• Procedural law, a ruleset governing the application of laws to cases
  • A law, which may informally be called a "rule"
• Norm (sociology), an informal but widely accepted rule, concept, truth, definition, or qualification (social norms, legal norms, coding norms)
• Norm (philosophy), a kind of sentence or a reason to act, feel or believe.

• A ruler, a measurement tool for small lengths
• The term "rule of thumb", an idiom for an estimation procedure

• "Rulership" is the concept of governance by a government:
  • Military rule, governance by a military body
  • Monastic rule, the basis upon which a monastic order is run

Other uses

• The Golden Rule (ethics), a principle of reciprocity common througout all or most religious systems
  • Ethic of reciprocity, a more general name for this concept in worldwide religion
  • Golden rule (law), the application of this concept to British law
• Rules of Acquisition, a set of guidelines intended to ensure the profitability of businesses owned by the ultra-capitalist Ferengi in the fictional Star Trek universe
• The Rules, a bestselling self-help book
• RULE Project (Run Up-to-date Linux Everywhere) is a project that aims to use up-to-date Linux software on old PCs
• Rule engine, a software system that helps managing business rules
• Ja Rule, a hip hop artist
  • R.U.L.E., a 2005 greatest hits album by rapper Ja Rule
• The Rule, a soul/reggae band
• During Spring Break, there are generally no rules.

Pravidlo | Regel | Regel | Regla | Regulo | Règle | Regulo | 規則 | Reguła | Правило | Rule