Antistropic Shader

• creates surfaces with elliptical, "anisotropic" highlights. These highlights are good for modeling hair, glass, or brushed metal. The basic parameters are similar to those for Blinn or Phong shading, except for the Specular Highlight parameters, and Diffuse Level controls such as those for Oren-Nayar-Blinn shading.

SOURCE:
https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMax/files/GUID-30F365F1-602D-4E7D-8C97-6BF67673683B-htm.html