Crux ansata | Webster's Dictionary of the English Language

crux
crux, ŭcis, f. (m., Enn. ap. Non. p. 195, 13; Gracch. ap. Fest. s. v. masculino, p. 150, 24, and 151...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
crux
crux ucis, f CVR-, a gallows, frame, tree (on which criminals were impaled or hanged), C.— A cross...

An Elementary Latin Dictionary
Crux
·noun Anything that is very puzzling or difficult to explain. ...

Webster's Dictionary of the English Language