Artifacts
- Addendum circle
- Belt problem
- Circular ditches
- Circular slide rule
- Compass (drafting)
- Crop circle
- Dip circle
- List of gear nomenclature
- Peaucellier–Lipkin linkage
- Pitch circle
- Repeating circle
- Timber circle
- Traffic circle
- List of circles in Washington, D.C.
- List of traffic circles in New Jersey
- Setting circles
- Stone circle
- Wheel
Read more about this topic: List Of Circle Topics