Illustrated Glossary of Organic Chemistry

Stereocenter (chiral center): An atom with three or more different attachments, interchanging of two of these attachments leads to another stereoisomer. Most commonly, but not limited to, an sp³ (tetrahedral) carbon atom bearing four different attachments.

Stereocenters at sp3 carbon		Stereocenters at sp2 carbon		Sulfur and nitrogen stereocenters