What does SOS stand for?

Switched-On Schoolhouse (Alpha Omega Publications)

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

Business, finance, etc.

Other Resources:

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Surveillance Operating System (Hekimian) Survival on Snow Survival Optics Sunglasses Survivor Outreach Services (US Army) Survivors of Suicide Swamp of Sorrows (gaming, World of Warcraft) Swedish Obese Subjects (study) Swedish Optical Society (est. 1991) Switch off Something (government initiative; UK) Switch on Shropshire (UK)		Sword of Skardsen (Neopets) Sygate Online Services Symbian Operating System Symbolic Operating System Syndicated Office Systems System Of Systems System Operation Status (Sprint) System Operational Specification System Operations Support System-of-System

Samples in periodicals archive:

had already established itself in the home-school industry, selling textbooks before it began offering software in 1997 called Switched-On Schoolhouse that mapped out classes for grades three to 12.

Home-schooling goes high tech Educational software, Internet programs ...