can
To abort a job on a {time-sharing} system. Used especially
when the person doing the deed is an operator, as in "canned
from the {console}". Frequently used in an imperative sense,
as in "Can that print job, the LPT just popped a sprocket!"
Synonymous with {gun}. It is said that the ASCII character
with {mnemonic} CAN (0011000) was used as a kill-job character
on some early OSes. Alternatively, this term may derive from
mainstream slang "canned" for being laid off or fired.
[{Jargon File}]