Other forms: physiognomies
The word physiognomy means the appearance of someone's face. When traveling in Italy, you may be struck by the pleasing physiognomy of the marble statues sculpted during the Renaissance.
The reason physiognomy sounds like it should be something you study in school right after biology, geometry, and astronomy is that people used to think that it was a science by which you could tell someone's character through their facial features. If you've ever read any Nancy Drew stories, you will know how this plays out — anyone with "shifty eyes" is not to be trusted.