Definition:Argand Diagram

Definition
Because a complex number can be expressed as an ordered pair, we can plot the number $x + i y$ on the real number plane $\R^2$:


 * ComplexPlane.png

This representation is known as an Argand diagram.

Also known as
Some sources refer to this as an Argand plane.

It is also sometimes known as a Gauss Plane, or Gaussian Plane, but as it is now recognised that neither nor  had precedence over the concept of plotting complex numbers on a plane, the more neutral term complex plane is usually preferred nowadays.