Related Clues:

• Indirect lines
• Rainbow curves
• Some compass drawings
• Firecrackers' paths
• Parentheses shapes
• Pendulums' paths
• Raised eyebrows, e.g.
• Welding sparks
• Parts of circles
• Curves in cars
• Welding bands?
• Streaks of electrical discharges
• Paths of planets
• Curves about cars
• Portions of a circle