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scroll lock

n. (context computing English) (alternative spelling of Scroll Lock English)

Wikipedia
Scroll lock

Scroll lock (⤓ or ⇳) is a lock key (typically with an associated status light) on most IBM-compatible computer keyboards.

Depending on the operating system, it may be used for different purposes and applications may assign functions to the key or change their behaviour depending on its toggling state.

The key is not frequently used, and therefore some reduced or specialized keyboards lack altogether.

Pressing performs the same function as pressing . This behavior is a remnant of the original IBM PC keyboards; they did not have a dedicated key. Instead, they assigned the Pause function to and the Break function to .