Remember " twisty maze of passages, all alike "? From Rick Adams we have the origins of XYZZY, i.e., it was a mathematical in-joke. To quote But Ron Hunsinger believes there is a more meaningful origin to the 'XYZZY' word: "[XYZZY is] taught by math teachers the world around as a mnemonic device to remember how to do cross products. "When I first played Adventure, finding 'xyzzy' in it was like finding an old friend in an unlikely place. Or an inside joke." — Ron Hunsinger "'Cross products?' you ask. "Indeed. The cross product of two three-dimensional vectors is the vector whose length is the area of the parallelogram with the two given vectors as adjacent sides, and direction perpendicular to the plane of that parallelogram. "There is a 'simple' formula for the cross product. If A = B x C, where A, B, and C are the vectors (Ax, Ay, Az), (Bx, By, Bz), and (Cx, Cy, Cz), then: A x = B y C z ...