Gnomon (figure)

A gnomon is a geometric figure used primarily in the context of sundials and can also refer to a specific part of a shape in geometry. 1. **Sundial Context**: In sundials, the gnomon is the part that casts a shadow, typically a vertical rod or a triangular blade positioned at an angle. The shadow it casts is used to indicate the time of day by aligning with markings that represent the hours.