The term helicity has several meanings in physics, all referring (perhaps obliquely) to a phenomenon that resembles a helix. See:

• helicity (fluid mechanics)
• helicity (particle physics)
• magnetic helicity
• circular dichroism

In biochemistry, helicity may also refer to the amount of alpha helix represented in the secondary structure of a protein.

In chemistry, helicity may refer to a type of planar chirality.

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