A propeller is a chiral structure. Propellers can have low or large pitch. Pitch differences can be seen as distinguishing propellers with low chirality from those with large chirality.


Is there a general way, given a closed 3d shape, to quantify its chirality? Is there some sort of integral over the shape that yields a number quantifying the degree of chirality of that shape?



Is there a way to quantify the chirality of a 3d shape?
This is a topic of some research, summarized in [On quantifying chirality — Obstacles and problems towards unification](https://link.springer.com/article/10.1007/BF01277559). One metric is the Hausdorff chirality, which quantifies the chirality of a geometric representation of an object by measuring the degree of coincidence of the object with its mirror image, see [The Hausdorff chirality measure and a proposed Hausdorff structure measure.](https://www.semanticscholar.org/paper/The-Hausdorff-chirality-measure-and-a-proposed-Yewande-Neal/0a7f7b2433ff23383fbf247e8a50381b0c8efae5)


