Which term describes a spiral or coil shape?

The term that describes a spiral or coil shape is "helix." A helix is a three-dimensional curve that resembles the shape of a spring or spiral staircase, characterized by its continuous and smooth curve moving around a central axis while also rising or falling in height. This unique structure is often found in nature, such as in the shape of DNA molecules, and can be seen in various applications including architecture and engineering.

Other terms like "sine" refer specifically to mathematical functions that describe wave patterns and do not inherently denote a spiral shape. "Spiral" is a two-dimensional term that can describe a similar shape but does not capture the three-dimensional nature of a helix. "Curve" is a broader term simply indicating any continuous and smooth path, lacking the specificity of the coiled or spiral nature captured by "helix." Hence, "helix" is the most precise term to describe a spiral or coil shape.