"true divided muntin" or "glazing bar"


A true muntin is a strip of wood or similar material completely separating panes of glass. In the modern world, the illusion of muntins is created by sandwiching thin strips of aluminum or plastic between double-paned glass, or by affixing these grilles onto the outside of the glass.

http://homerenovations.about.com/od/windowsanddoors/g/muntin...

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Note added at 1 hr (2013-08-02 15:07:41 GMT)
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or "true divided light muntin"

introducing the world's first 1 1/16” true divided light muntin; Introducing the first 7/8” true divided light muntin
http://www.customwindow.com/history.html



A muntin is a strip of wood or metal separating and holding panes of glass in a window.[1] Muntins are also called "muntin bars", "glazing bars", or "sash bars". Muntins can be found in doors, windows and furniture, typically in western styles of architecture. Muntins divide a single window sash or casement into a grid system of small panes of glass, called "lights" or "lites".
http://en.wikipedia.org/wiki/Muntin