Bottom dish radical (Kangxi #108) - the indexing radical. A pictograph of a wide-mouthed shallow bowl seen from the side, with the base at the bottom and the rim above. Anchors
盆 firmly in the vessel/container family alongside
盘 (plate),
盖 (lid),
盐 (salt-pot),
盒 (box) - every char with this radical is some kind of dish, basin, or open container.