Nomen novum

In biological nomenclature, a nomen novum (Latin for "new name"), replacement name (or new replacement name, new substitute name, substitute name) is a replacement scientific name that is created when technical, nomenclatural reasons have made it impossible to continue using the previous name (for example because it was discovered to be a homonym – spelled the same as an existing, older name). Nomen novum does not apply when a name is changed for taxonomic reasons (representing a change in scientific insight). It is frequently abbreviated, e.g. nomen nov., nom. nov..

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