/heks/
n. 1. Short for hexadecimal, base 16.
2. A 6-pack of anything (compare quad, sense 2). Neither usage has anything to do with magic or black art, though the pun is appreciated and occasionally used by hackers.
True story: As a joke, some hackers once offered some surplus ICs for sale to be worn as protective amulets against hostile magic. The chips were, of course, hex inverters.