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Hapax legomenon 

noun (pl. hapax legomena or hapaxes)

A word that appears only once in a text corpus or body of writing—be this a particular author's oeuvre, a work of substantial length, or a language's entire collection of writing, including the Twittersphere.

From Ancient Greek hápax legómenon ("thing once said").
The old Ottoman Governments regarded this clan of manticratic peers with a mixture of reverence and distrust.
—T. E. Lawrence, 1926

Despite the constant negative press covfefe
Donald Trump producing a hapax legomenon of his own, 2017
Hapax legomenon by DrSJohnson January 30, 2020
Related Words

hapax legomenon 

hapax legomenon by Duke September 24, 2003

Hapax legomenon 

A Hapax legomenon is a word or expression that only occurs one time.

This can be abbreviated as Hapax.
There is this one word in a book that I found that is only mentioned once. This is an Hapax legomenon.