About
蠊 is a phono-semantic compound with the radical 虫 on the left, indicating an insect, and 廉 on the right, which supplies the pronunciation "lián". Its use is almost entirely confined to the binomial 蜚蠊 (fěilián), the formal scientific term for cockroach. The character has no simplified or traditional variants, and its structure, combining the insect radical with a phonetic element, serves specifically to denote this single insect without broader semantic shifts.