Double-helix piercings are when you get two helix or cartilage piercings close together. You can mix and match or "twin out" your jewelry to create a look.

Scientists propose “DNA of the universe” is gap in Einstein’s hunt for unified physics theory Physicists say they detected a double helix in the fabric of spacetime ...

Yes, thanks to this present from my awesome friend Alice Bell, I now get to wind an illusory double helix around my neck. There’s probably a joke about histones to be made.