Wiktionary
least significant bits
n. (least significant bit English)
Usage examples of "least significant bits".
Usually it means something like manipulating the least significant bits of an image file to convey a text message.
It moved without momentum or inertia, gravity or friction, merely tweaking the least significant bits of the input navigator's requests for data, which the scape interpreted as the position and angle of the orphan's point-of-view.