Related Clues:

• Letter on Superman's chest
• Snaky curve
• It's all wound up
• It's at the end of strings?
• Winding road part
• Curvy letter
• Superman symbol
• It goes this way and that
• Curvy road shape
• Lead-in to the tee?
• Tee's predecessor
• DNA shape
• You can't have support without it
• Self starter
• Relative of -trix