line noise: n. 1. [techspeak] Spurious characters due to
electrical noise in a communications link, especially an RS-232
serial connection. Line noise may be induced by poor connections,
interference or crosstalk from other circuits, electrical storms,
cosmic rays, or (notionally) birds crapping on the phone wires.
2. Any chunk of data in a file or elsewhere that looks like the
results of line noise in sense 1. 3. Text that is theoretically a
readable text or program source but employs syntax so bizarre that
it looks like line noise in senses 1 or 2. Yes, there are languages
this ugly. The canonical example is TECO; it is often claimed
that "TECO's input syntax is indistinguishable from line noise."
Other non-WYSIWYG editors, such as Multics `qed' and Unix `ed', in
the hands of a real hacker, also qualify easily, as do deliberately
obfuscated languages such as INTERCAL.