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.
The Ü symbol only applies to the German market. Other countries have their own processes with non-regulated construction products.