# surface normal

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## English[edit]

### Noun[edit]

**surface normal** (*plural* **surface normals**)

- (differential geometry) A unit vector at any given point
*P*of a surface*M*which is perpendicular to the tangent plane*T*of_{P}(M)*M*at*P*. For a surface with parametrization , it is given by

- where the sign can be chosen at will.