The glazing stop is the piece of millwork that butts-up against the glass to hold it in place and comes in different profiles to achieve architectural detail appropriate for the style of the home. In additions to the glazing stop, there are matching Simulated Divided Lite bars or muntins or SDL or even grilles as they may be called, that create the look of divided lites. Look for the matching SDL profiles in the SDL section.
Interior Profiles Glazing Stop (Ogee Profile)
Interior Putty Glazing Stop
Interior Square Glazing Stop