it is acceptable to break rules.

a rule of thumb by which a driver may maintain a safe following distance, allowing at least a two second interval behind any vehicle that is directly in front of the driver's vehicle.

(law, singular only) The rule that prevents a testator or other transferor of property from controlling further transfer of his property more than twenty-one years after the death of anyone alive at the time of the original transfer who may have some interest in the transfer.

plural of rule against perpetuities

A common mnemonic for understanding notation conventions for vectors in three dimensions. / (logic) The systematic use of right-hand turnings to solve a maze.

(sports) A rule whereby, in case of an aggregate draw, the team with the most away goals wins.

plural of prudent man rule

(chess) A rule in professional chess that a player may declare the game to be a draw after 50 consecutive moves by each side without any capture or pawn movement, usually invoked during an inconclusive endgame.

(chess) The rule stating that, if a player intentionally touches a piece when it is their turn, they must move or capture the piece if it is legal to do so.

Any rule that prescribes or proscribes behavior in a three-second interval, especially