Triple glazing

[Sonia]

three layers of glass in a door or window that are separated by air spaces to prevent heat from escaping from a room or to reduce the amount of noise coming in from outside:

[Britney]

Meaning of triple glazing in English three layers of glass in a door or window that are separated by air spaces to prevent heat from escaping from a room or to reduce the amount of noise coming in from outside: The insulation from triple glazing is significantly greater than that from double glazing.