In another thread, I started to derail with a question based on something said ratagonia said, wanted to move the conversation: I've wondered about this myself... Any idea how the cordage came to be called a VT? Seems unique to canyoneering, though the same thing has happened in rock climbing with the equipment taking the name of the usage / knot most commonly tied with it. ("prusik" , "autoblock") For what it's worth, in arboriculture it's usually a "hitch cord" or "friction hitch cord" - probably because there's such a wide array of hitches in use. Feel free to borrow the terminology. @hank moon brought up the Bluewater "VT Prusik" product - is that where it comes from?