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NNN or New Nordic Norm is a binding system primarily used in Cross Country skiing. The main feature of the NNN system is a metal rod in the toe of a ski boot sole. The boot is held into the binding by a clamp, which allows the heal of the boot to lift up and down.
The binding also features two raised surfaces that fit into corresponding grooves on the bottom of a ski boot, which provide greater lateral stability than the older three-pin binding system.
There are two types of NNN bindings, NNN Touring and NNN BC, which stands for Backcountry. The raised rails of the BC binding and the metal rod are wider than the touring system, which provides yet more stability.