Geometry Compass Set
A compass for drawing circles and arcs.
A pencil (or a pencil holder in some variations) for marking the circles/arcs.
It is commonly used for:
Mathematics and Geometry: Creating precise circles and arcs for geometric constructions.
Drafting and Technical Drawing: Used by architects, engineers, and designers for accurate drawings.
Woodworking and Carpentry: Larger versions are used for marking out curves and circles on materials