Hex
1.
hexadecimal.
2. A 6-pack of anything (compare
quad).
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.
3. <character> The
hash character, used to introduce
hexadecimal constants in some
assembly languages.
[
Jargon File]