A beater is a weaving tool used to push the weft yarn firmly into place.
It consists of a wooden frame, with a wide horizontal slat above, which might
either have a separate handgrip or otherwise simultaneously serves as the
handgrip, and a narrower horizontal slat or bar below. In between and all along
the length of both horizontal slats is a comb-like structure of vertical strips
of a rigid material, often thin metal strips, through which the warp threads
pass. In Thai, this weaving tool is referred to as