quadrants >> /ˈkwɒdr(ə)nt/
Definition: [noun] Each of four quarters of a circle.
Example: Arrange the bricks evenly around the circumference, leaving no large gaps, then divide the circle into four equal quadrants with remaining bricks.
Definition: [noun] An instrument used for taking angular measurements of altitude in astronomy and navigation, typically consisting of a graduated quarter circle and a sighting mechanism.
Example: Millburn shows that much of the business, for George Sr. and Jr., was in quadrants and other navigational instruments.
Definition: [noun] A frame fixed to the head of a ship's rudder, to which the steering mechanism is attached.
Example: Cables or chains run round a quadrant attached to the top of the rudder shaft.