We’d call it threaded back in weaving class. It just means setting up your warp, stringing many threads through what looks like rows of whale teeth in the back of the loom, and then getting them taut and ready for putting int he weft, which is the action that people think of when they think of weaving. It’s sometimes the much longer and more frustrating process, though – especially if you make something like a warp-face rug. Or do you mean even before that? With the whole thing as yet untouched? We had no particular term for that state of being.