A prolonge knot, also known as a prusik knot, is a type of friction knot used to attach a cord to a stationary object. There are several synonyms for this knot, including the Bachmann knot, Klemheist knot, and French prusik knot. Each of these knots functions similarly to the prolonge knot, but with slight variations in the method of tying and use. These knots are commonly used in climbing and mountaineering, as well as in sailing and rescue operations. Knowing different synonyms for the prolonge knot can be useful in different applications and situations where one type of knot may be more appropriate than another.