xyzzy/ˈzɪzi/EtymologyFrom the seminal text adventure game Adventure (c.1975), where it served as a "magic word"; possibly originated as a mnemonic for the subscripts of the cross product in mathematics.nounUsed as a placeholder word or metasyntactic variable.“Especially bad are "magic words" from computer games, such as xyzzy. These magic words look secret and unguessable, but in fact they are widely known.”