Here are some characteristics of a square face shape:
* Defined jawline: The jawline is straight and angular, with a strong, almost 90-degree angle.
* Equal width and length: The face is almost as wide as it is long, giving a balanced, symmetrical appearance.
* Strong cheekbones: Prominent cheekbones contribute to the angular look of the face.
* Wide forehead: The forehead is generally wide and can appear slightly squared.
You can observe these characteristics in Jim Parsons' face, particularly the defined jawline and strong cheekbones, which contribute to Sheldon Cooper's distinct and somewhat quirky appearance.