Chirality exists widely in nature and shows important symmetry characteristics in many disciplines. If an object is different from its mirror image, it is called a "hand sign", and its mirror image cannot overlap with the original object, just as the left hand and the right hand are mirror images of each other and cannot overlap. Chiral objects and their mirror images are called enantiomers (Greek means "relative/opposite forms"); It is also called enantiomer in the reference of molecular concept. An object that can overlap its mirror image is called achiral, sometimes called chiral.

Carbon atoms with four different groups are called chiral carbon atoms (often marked with *).

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