Helix
smooth space curve
In math, a helix is a curve in three dimensions. It looks a bit like a spiral. Each helix has a line called its axis. The helix has a constant angle to this line. Helices are often seen in nature and the sciences.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/VaticanMuseumStaircase.jpg/220px-VaticanMuseumStaircase.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/DirkvdM_natural_spiral.jpg/220px-DirkvdM_natural_spiral.jpg)
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