from the shallows of wikipedia (12. 687)

Via Super Punch, we learn that the honest-to-goodness academic term for the kink that can sometimes occur in both naturally-occurring and manufactured helix-based structures, like in knotty Christmas lights or the twisting of a telephone handset cord, is tendril perversion—which the article’s header helpfully disambiguates from Japanese tentacle based erotica (don’t get them confused). Already established as the accepted turn of phrase by the time of Charles Darwin and contemporary botanists, the phenomena was noted as the invariable twist in the spiral of a growing vine or sprouting seedling, and was formalised as a way to describe the elastic geometry of breaking symmetry and chirality.