What does COS stand for?

Change Over Switch

This definition appears very rarely

Other Resources:

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Certificate of Suitability (European Directorate for the Quality of Medicines Agency; Council of Europe; France) Certified Occupancy Specialist (housing industry) Chamber of Secrets (book by J.K. Rowling) Chamber Orchestra of the Springs (Colorado Springs, CO) Chance of Success (Oil and Gas) Change of State Change Of Station Change Of Status Change Of Subject Change of Subscriber		Charity Organization Society Check on-Site Chemical Operation Specialist Chicks on Speed (band) Chief of General Staff (Israel) Chief of Safety Chief of Staff Chief of Station (CIA) Chief of Supply Chiefs of Service (hospitals)