Possible Clues:

• Spiral staircase, essentially
• Spiraling shape
• Object with a three-dimensional shape, like a corkscrew
• Single strand of DNA?
• Double ___ (DNA structure)
• Ornamental spiral
• Intertwining with another, AND vice versa
• Snail that goes round and round and up and down
• Spring shape
• Spiral structure, DNA is a double one