BT BB 83b(8) :וכל שכן כחצ{י}<ו>בא ומאן דאמ׳ כחצובא אבל כשורה לא מזדבנא‏ : all the more so in a triangular shape; but for the one who says in a triangular shape, if it is row-shaped it is not sold
See the entire entry for ḥṣwb#2 n.m. tripod stand