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Letters naming which side of a double bond groups sit on.
Also known as: Cis and trans, Geometric isomerism descriptors
E and Z name the arrangement across a double bond using the same priority rules as R and S. They replaced cis and trans because those older terms are ambiguous when the two ends carry different substituents.
Name the configuration across a double bond, Z for higher-priority groups on the same side and E for opposite sides.
Contexts: Laboratory
Replaced the older cis and trans terms, which become ambiguous once the two ends of the bond carry different substituents.
Contexts: Laboratory
A single italic capital letter enclosed in brackets before a chemical name.