A circle is a simple shape in Euclidean geometry. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius.

The Centre for Innovation, Research and Competence in the Learning Economy (CIRCLE) is an interdisciplinary research centre situated in Lund, Sweden. It is spanning several faculties at Lund University and Blekinge Institute of Technology. The activities cover the field of innovation, entrepreneurship, knowledge creation and economic growth.