title: Indicatrix
text: # 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
  