present participle of rule OK

plural of ruling pen

(European Union law) A decision of the European Court of Justice (ECJ) on the interpretation of European Union law, made at the request of a court or tribunal of a European Union member state.

plural of ruling grade

(rail transport) synonym of ruling gradient

plural of preliminary ruling

(computing, informal) The rule that a database, a user interface, etc. should allow for either zero, one, or an indefinite number of an entity.

Alternative form of there is an exception to every rule

(statistics mnemonic) The rule stating that a normal distribution will have 68% of its observations within one standard deviation of the mean, 95% within two, and 99.7% within three.

(physics) A mnemonic that uses the right hand to show the direction of induced current when a conductor moves in a magnetic field. The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other; then the thumb represents the direction of motion of the conductor; the first finger represents the direction of the field; and the second finger represents the direction of the induced or generated current.