What is the meaning of Hex?

To cast a spell on (specifically an evil spell), to bewitch.

An evil spell or curse.

A witch.

A spell (now rare but still found in compounds such as hex sign and hexcraft).

Clipping of hexadecimal.

A hexagonal space on a game board.

a hexagon-shaped item of rock climbing equipment intended to be wedged into a crack or other opening in the rock.

Clipping of uranium hexafluoride.

Source: wiktionary.org