可塞 Traditional form: 可塞 Pinyin (reading): kěsài Definitions: xi or ksi (Greek letter Ξξ) Characters: 可 - may, can, -able; possibly 塞 - to stop up, to seal, to cork, to block; pass, frontier; fortress Traditional characters: 可 - may, can, -able; possibly 塞 - to stop up, to seal, to cork, to block; pass, frontier; fortress