Runic

/rü-nik/

adj. Syn. obscure. VMS fans sometimes refer to UNIX as 'Runix'; UNIX fans return the compliment by expanding VMS to 'Very Messy Syntax' or 'Vachement Mauvais Système' (French; lit. "Cowlike Bad System", idiomatically "Bitchy Bad System").

More Jargon:

Root Mode
Case and Paste
Bells and Whistles