The insect radical. Originally a pictograph of a coiled snake (read huǐ), later generalized to all small crawling creatures. One of the most productive semantic radicals in the language, covering insects, reptiles, molluscs, parasites, and amphibians: 蛇, 蜘, 蛛, 蚊, 蛤, 蜗, 蝙, 蝠, 螃, 蟹.