- noun a four-sided plane figure with four right angles, and with opposite sides of equal length
- A quadrilateral with four right angles and two pairs of sides of equal length. When all four sides are equal, it is a square.
- A classic technical chart pattern characterized by parallel support and resistance lines that fall respectively below and above the current market. Forex range traders often look for a rectangle pattern to start range trading and can also profit from its eventual breakout move that will usually extend to at least the height of the rectangle measured from the breakout point.