店 (diàn) 'shop' is a phono-semantic compound. The radical 广 (a roof or building) gives the meaning of a structure, while 占 (zhàn) supplies the sound. The character names a roofed place set up for selling goods, a shop or store.

Origin

phono-semantic compound

Root

广 (building, semantic) + 占 (zhàn, phonetic)