Literature Reference: 禁门宫树月痕过，媚眼唯看宿燕窠。—— 《赠内人》 The moonlight passes the palace trees at the forbidden gate, and the charming eyes only gaze at the nest of the roosting swallows. Source from 'To the Inner Court Lady'.
宿: Celestial Mansions.
燕: The swallow. In names, it often symbolizes good fortune and peace, signifying auspiciousness, health, and a beautiful life.
Meaning: Roosting swallows symbolize returning home, peace, and warmth.