It's another term for a spiral, especially when talking about spiraled strands of DNA
... in a 
talk recently, DNA simultaneously encodes multiple overlapping signals, just like 
... What: "DNA is like a spiral staircase, with each step of the staircase rising 0.34 
..... DNA strand on the surface of one cell and its complementary strand on 
another... [DOC] [TLE] SUPERHUMANS-