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

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