A crux is a textual passage that is corrupted to the point that it is difficult or impossible to interpret and resolve. Cruxes are studied in palaeography, textual criticism, bibliography, and literary scholarship. A crux is more serious or extensive than a simple slip of the pen or typographical error. The word comes from Latin crux, Latin for "cross", used metaphorically as a difficulty that torments one.[1] Cruxes occur in a wide range of pre-modern (ancient, medieval, and Renaissance) texts, printed and manuscript.