grep = G = grilf

gribble n.

Random binary data rendered as unreadable text. Noise characters in a data stream are displayed as gribble. Modems with mismatched bitrates usually generate gribble (more specifically, baud barf). Dumping a binary file to the screen is an excellent source of gribble, and (if the bell/speaker is active) headaches.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.