Literature Reference: 'Han' refers to the Milky Way, as stated in 'Shuowen'; 'Kai' means harmony, as recorded in 'Erya'.
汉: The name of a river, the Han River, the largest tributary of the Yangtze River. It extends to signify vastness, benevolence, open-mindedness, and magnanimity.
凯: Triumphant song, a victorious return. It metaphorically signifies exceptional ability leading to certain success.
Meaning: 'Han' symbolizes the vastness and eternity of the Milky Way, while 'Kai' represents victory and harmony.