Quadrant

A quadrant is one of the four regions of a coordinate-plane, divided by the x-axis and y-axis. They are numbered counterclockwise starting from the top right:

• Quadrant I: (+, +)
• Quadrant II: (−, +)
• Quadrant III: (−, −)
• Quadrant IV: (+, −)

The signs of a point's coordinates identify its quadrant. Points on an axis belong to no quadrant.