空集

Traditional form:

空集

Pinyin (reading):

kōngjí

Definitions:

• empty set (set theory)

Characters:

• 空 - hollow, empty, deserted, bare
• 集 - to gather, to collect; set, collection

Traditional characters:

• 空 - hollow, empty, deserted, bare
• 集 - to gather, to collect; set, collection