Related Clues:

• A lot of sissies?
• Parts of loops
• Curves made by fly balls
• Curves in the road
• The end of class?
• Tricky turns
• The three in each of this puzzle's theme entries
• Lispers' challenges
• Snaky curves
• Hyperbola parts
• Switchback features
• Lobs' paths
• Bridges between electrodes
• Curved letters
• Eyebrows, usually