Related Clues:

• Trajectories produced by gravity
• Golf ball courses
• Oval segments
• Rainbow paths
• Storyline paths
• Indirect lines
• Rainbow curves
• Some compass drawings
• Firecrackers' paths
• Parentheses shapes
• Pendulums' paths
• Raised eyebrows, e.g.
• Euclid's arms?
• Welding sparks
• Elbow-to-wrist bones