Glass in the common sense refers to a hard, brittle, transparent, solid, such as that used for windows, many bottles, or eyewear, including, but not limited to, soda-lime glass ...
http://en.wikipedia.org/wiki/Glass

August 13, 2008 - Glass Magazine Announces Largest Issue in Publication's History ... Learn More > July 22, 2008 - MyGlassClass.Com Now Offering AGRSS-Approved Training ...
http://www.glass.org/

glass.com - The Glass Industrys Home Address on the World Wide Web.
http://www.glass.com/

Get 3 local online windshield replacement & auto glass repair quotes instantly. Glass.net offers free mobile service from windshield professionals
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Being an AGRSS registered auto glass company or having certified auto glass technicians should be a significant part of your sales pitch to a customer.
http://blog.glass.net/