The basic, central, or essential point or feature. / The critical or transitional moment or issue, a turning point. / A puzzle or difficulty. / (climbing) The hardest point of a climb.

(astronomy) A distinctive winter constellation of the southern sky, shaped like a cross. It appears in the flags of several countries in Oceania.

plural of crux

A single beam or pole without a cross bar for executions.

(Latin phrase) The tetra-gammadion.

Synonym of ankh

A diagonal cross, resembling the letter X.

A cross made of a horizontal beam affixed to a vertical post, used for the execution of criminals during the Roman historical period.

(climbing) most difficult (part of a climb)