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* 118: Uuo, ununoctium; Og, oganesson.

When elements beyond oganesson (starting with ununennium, Uue, element 119), are discovered; their systematic name and symbol will presumably be superseded by a trivial name and symbol.

Alchemical symbols

The following ideographic symbols were used in alchemy to denote elements known since ancient times. Not included in this list are

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