空集 Save Sign in to save words kōngjí ㄎㄨㄥ ㄐㄧˊ empty set (set theory) Character by character 空(kōng)empty 集(jí)gather Other words read kōngjí kongji with other tones 空寂 Often confused with kongji 阃寄 鹍鸡 Other words read kōngjí kongji with other tones 空寂 Often confused with kongji 閫寄 鵾雞 A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0