Editing Helix (section)

==Examples==
An example of a double helix in molecular biology is the [[nucleic acid double helix]].

An example of a conic helix is the [[Corkscrew (Cedar Point)|Corkscrew]] roller coaster at [[Cedar Point]] amusement park.

Some curves found in nature consist of multiple helices of different handedness joined together by transitions known as [[tendril perversion]]s.

Most hardware [[screw thread]]s are right-handed helices. The alpha helix in biology as well as the [[A-DNA|A]] and [[B-DNA|B]] forms of DNA are also right-handed helices. The [[Z-DNA|Z form]] of DNA is left-handed.

In [[music]], [[pitch space]] is often modeled with helices or double helices, most often extending out of a circle such as the [[circle of fifths]], so as to represent [[octave equivalency]].

In aviation, ''geometric pitch'' is the distance an element of an airplane propeller would advance in one revolution if it were moving along a helix having an angle equal to that between the chord of the element and a plane perpendicular to the propeller axis; see also: [[pitch angle (aviation)]].

<gallery heights="225px" widths="225px">
Image:Lehn Beautiful Foldamer HelvChimActa 1598 2003.jpg|Crystal structure of a [[foldamer|folded molecular helix]] reported by [[Jean-Marie Lehn|Lehn]] ''et al.''<ref>{{cite journal|last1=Schmitt |first1=J.-L. |last2=Stadler |first2=A.-M. |last3=Kyritsakas |first3=N. |last4=Lehn |first4=J.-M. |date=2003 |title=Helicity-Encoded Molecular Strands: Efficient Access by the Hydrazone Route and Structural Features |journal=Helvetica Chimica Acta |volume=86 |issue=5 |pages=1598–1624 |doi=10.1002/hlca.200390137}}</ref>
Image:DirkvdM natural spiral.jpg|A natural left-handed helix, made by a [[vine|climber]] plant
Image:Magnetic_deflection_helical_path.svg|A charged particle in a uniform [[magnetic field]] following a helical path
Image:Ressort de traction a spires non jointives.jpg|A helical [[coil spring]]
</gallery>