Flash Lights Impressively
<programming, command, humour> (FLI) /FLY/ A joke
assembly language instruction first documented in the late 1970s in "The Hackers Dictionary".
The FLI instruction was frequently referred to by engineers when minicomputers such as the DEC PDP-8,
PDP-11 and some early microcomputers such as the
IMSAI and Altair had dozens of front panel lights.
"When the computer is about to do some long I/O operation, stick in a FLI so the accountants won't think the machine has hung again."
