abZ & DIBt
The Ü symbol found on an anchorage device indicates that it complies with its national technical approval (German: “abZ”).
The Ü symbol is used to identify construction products that demonstrably comply with the requirements of the respective state building regulations. Such certification is required where the construction product in question does not comply with any of the harmonised European standards.
Respective certification may, for example, be provided in the shape of national technical approval (“abZ”) awarded by the DIBt (German Institute for Construction Technology).
The Ü symbol only applies to the German market. Other countries have their own processes with non-regulated construction products.