Laminated glass is actually individual levels of glass which can be bonded together with polyvinyl butyral resin (PVB). This kind of glass for staircases is extremely popular, specially when combined with tempered glass. In case of breakage, it cracks in an internet pattern identical to an automobile windshield does. So https://stairfactory.co.uk/Products/staircase-with-a-metal-stringer/