What does NSF56k stand for?

MLA style: "NSF56k." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Not-Suitable-for-56k-Modem-(NSF56k).html
Chicago style: Acronym Finder . S.v. "NSF56k." Retrieved February 11 2012 from http://www.acronymfinder.com/Not-Suitable-for-56k-Modem-(NSF56k).html
APA style: NSF56k. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Not-Suitable-for-56k-Modem-(NSF56k).html

Not Suitable for 56k Modem

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North South Foundation (est. 1989) Northwest Secessionist Forces (Deus-Ex game) Norway, Sweden, Finland (in order, left to right) Not Safe For Not So Fast Not Sufficient Funds (return check reason code) Notes Storage Facility (Lotus Notes) Nuclear Storage Facility Nuclear Structure Facility (Daresbury Laboratory, Cheshire, UK, now closed; National Sanitation Foundation Standard Number 49		National Scholastic Funding Alliance (Fairfield, OH) National Sports and Fitness Association National Student Financial Aid Naval Support Force, Antarctica Nevada State Firefighters' Association Non Stop Female Assassins Normal Section Forward Azimuth Not Safe for Adults Not Safe for Anything (content reference) Nova Scotia Federation of Agriculture (Canada)