hapax legomenon

(Gr. used or pronounced only once). Word or term which appears only once in a body of text or with a specific author.  (Lexicon van literaire termen, blz. 196; Martinus Nijhoff/Wolters Plantyn, 1998)

HA PAX / LE GO ME NON Veva Leye, an edition of het balanseer. Book presentation on november 8th of 2018, Zilverhof 34. see Leye, Veva

Not really what it was meant to indicate in a 2006 project by Leentje Vandenbussche, part of the sequel of the BASICS 2 presentation. As it turned out Leentje had made a  disappearance performance of it: a certain amount of words of WAITING FOR GODOT that disappeared, soon after they were mentioned for the first time.

second half of the word croxhapox