Two (or more) sticks located near the back of either a backstrap or a treadle loom that are placed into the same shed created by main shedding devices, so they simply hold the main weaving cross and help keep the warp yarns in alignments.

Excerpt from

Ann Rowe, “Glossary,” in Weaving and Dyeing in Highland Ecuador, edited by Ann Rowe, Laura Miller and Lynn Meisch (Austin: University of Texas Press, 2007): 289-295.