The offset overhand bend (OOB, ABoK No. 1410) is a conceptually simple and easy to tie 'end-to-end joining knot' (ie bend). It is formed by holding two rope ends next to each other and tying an overhand knot in them as if they were a single line. Due to its common use in several fields, this bend has become known by many names, such as thumb knot, openhand knot, one-sided overhand knot or flat overhand bend (FOB), though the terms "one-sided" and "flat" are considered incorrect. Geometry The term 'offset' refers to the knot core being displaced from the axis of tension. This geometry allows the knot to more easily translate around an edge - particularly a 90 degree edge. Uses Long used by weavers to join the ends of yarn, the offset water knot is very old. It was one of the knots likely identified among the possessions of Ötzi the Iceman, who dates from 3300 BC. The knot is also tied in a slipped form by mechanical balers to bind straw and hay, but this bend is not practical to use as a binding knot when tied by hand. In climbing and mountaineering For mountaineers/climbers, there tends to be a strong preference for using knots that are perceived to be relatively easy to tie - even when fatigued or in a less than optimal frame of mind - and so #1410 (Offset overhand bend) is favored. Climbers/canyoners need to retrieve their ropes after an abseil/rappel descent. The ability to retrieve ropes after an abseil descent is crucial - and in many cases, two ropes need to be joined to increase the distance that can be descended in one 'pitch'. The resulting knot that unites the two ropes needs be secure and stable, have a small footprint, and be resistant to jamming. There are ongoing discussions and debates about using offset joining knots, due to their vulnerability to capsizing under high loads, and some American climbers refer to it as the European death knot, abbreviated to EDK, with some sources recommending against its use. Knots with an 'offset' geometry have been implicated in some accidents and near-misses - although post accident retrieval of ropes for examination are usually inconclusive because the ropes have separated (and hence there is no remnant knot to examine). Many sources argue that the name 'EDK' is a misnomer, and the knot is safe for