Knights of the Lambda Calculus
= K =
Configurable options, even in software and
even those you can't adjust in real time. Anything you can
twiddle is a knob. "Has this PNG viewer got an alpha knob?"
Software may be described as having "knobs and switches" or
occasionally "knobs and lights".
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.