In mathematics, a Lissajous curve /ˈlɪsəʒ/, also known as Lissajous figure or Bowditch curve /ˈbdɪ/, is the graph of a system of parametric equations

which describe complex harmonic motion. This family of curves was investigated by Nathaniel Bowditch in 1815, and later in more detail by Jules Antoine Lissajous in 1857.