There are a few different synonyms for the phrase "extinction angle." One is "polarizer angle," which refers to the angle of a polarizing filter that allows light waves of a certain orientation to pass through. Another is "Brewster's angle," named after the Scottish physicist David Brewster, which is the angle at which polarized light is reflected from the surface of a non-metallic material. A third synonym is "Glan-Thompson angle," which is the angle between two polished prisms used to polarize light in spectroscopy and other scientific applications. Each of these phrases has a slightly different meaning and application, but they are all related to the manipulation of polarized light.