Indicatrix

Indicatrix may refer to:

Differential geometry

 * Dupin indicatrix, a conic section which describes the local shape of a surface
 * Tissot's indicatrix, which describes and visualizes the distortion of a map
 * Tangent indicatrix, an object in differential geometry related to a closed space curve

Optics

 * Indicatrix, a special case of the index ellipsoid in the study of crystals and refractive indices