A carabiner is an essential tool for outdoor enthusiasts and climbers, and it is known by various synonyms. Popular synonyms for carabiner in the climbing community are biner, snap, or krab. Other synonyms include hook, clip, or carabineer. In some countries, this essential device is referred to as a karabiner. Carabiners made for dog owners and pet lovers are known as dog clips, and they have a different shape than those used for climbing. In the industrial world, they are called safety snap hooks or shackles. Ultimately, the many different terms used to describe this small but vital tool show just how widely it is used in a variety of contexts.