塞 Traditional form: 塞 Pinyin (reading): Sāi Definitions: Serbia Serbian abbr. for 塞爾維亞/塞尔维亚 ( Sāi'ěrwéiyà) Characters: 塞 - to stop up, to seal, to cork, to block; pass, frontier; fortress Traditional characters: 塞 - to stop up, to seal, to cork, to block; pass, frontier; fortress