From the mirror image property of the translation-rotation coupling tensor (Ξ tr ), we have also discovered that achiral objects can also exhibit a non-zero molecular pitch. Indeed, any irregular, asymmetric body has non-vanishing translation-rotation coupling, but only some achiral objects can exhibit pitch as defined above. In the Supporting Information, we estimate the forward motion for a few achiral objects that exhibit pitch. Using the molecular pitch definition in Eq. ( ), we predict very similar behavior to the experiments on ferromagnetic microparticle 'swimmers' that were recently propelled through a stationary fluid using magnetic rotation by Cheang et al.