= N =
nerd knob n.
[Cisco] A command in a complex piece of
software which is more likely to be used by an extremely
experienced user to tweak a setting of one sort or another - a
setting which the average user may not even know exists. Nerd knobs
tend to be toggles, turning on or off a particular, specific,
narrowly defined behavior.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.