1. Someone who works on Cray supercomputers.
More specifically, it implies a programmer, probably of the CDC
ilk, probably male, and almost certainly wearing a tie
(irrespective of gender). Systems types who have a Unix background
tend not to be described as crayons. 2. Formerly, anyone who
worked for Cray Research; since the buyout by SGI, anyone they
inherited from Cray. 3. A computron (sense 2)
that participates only in number-crunching. 4. A unit of
computational power equal to that of a single Cray-1. There is a
standard joke about this usage that derives from an old Crayola
crayon promotional gimmick: When you buy 64 crayons you get a free
sharpener.