Chirality is the property of an object not being identical to its mirror image. An object is chiral if it is not identical to its mirror image; that is, it cannot be superposed onto itself. Conversely
A natural left-handed helix, made by a certain climber plant's tendril
Shells of two different species of sea snail: on the left is the normally sinistral (left-handed) shell of Neptunea angulata, on the right is the normally dextral (right-handed) shell of Neptunea despecta