What does NUM LOCK stand for?

MLA style: "NUM LOCK." Acronym Finder . 2012. AcronymFinder.com 1 Jun. 2012 http://www.acronymfinder.com/Number-Lock-(NUM-LOCK).html
Chicago style: Acronym Finder . S.v. "NUM LOCK." Retrieved June 1 2012 from http://www.acronymfinder.com/Number-Lock-(NUM-LOCK).html
APA style: NUM LOCK. (n.d.) Acronym Finder. (2012). Retrieved June 1 2012 from http://www.acronymfinder.com/Number-Lock-(NUM-LOCK).html

Number Lock

This definition appears very rarely and is found in the following Acronym Finder categories:

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National Unity Movement (Sierra Leone) National University of Management (Cambodia) National University of Mongolia Network Upgrade Manager (Nortel) Network Utility Maximization Neutrons and Muons New Urban Male Norton Utilities for Macintosh Number(s) Nurse Unit Manager		N User Map Archive National Underwater Marine Agency National Urban Maori Authority (est. 1986; New Zealand) Non Uniform Memory Access Non-Uniform Memory Allocation (Sequent) Non-Uniform Memory Architecture Numerical Analysis (conference) Nuclear Management and Resources Council Nuclear Utility Management and Resources Council (now Nuclear Energy Institute) National Union of Marine, Aviation and Shipping Transport Officers (UK)

Samples in periodicals archive:

For some digital lock safe models, changing the number lock combo is easy.

Windows XP support -- Supports Windows shortcut keys and F1-F12 keys, as well as number lock, print screen, insert, scroll lock and pause.

That's the only way to toggle the number lock and caps lock.