Literature Reference: 留连戏蝶时时舞，自在娇莺恰恰啼。—— 杜甫《江畔独步寻花·其六》 The lingering butterflies dance ceaselessly, while the carefree orioles sing in perfect harmony. — Du Fu 'Strolling Along the Riverbank in Search of Flowers, No. 6'.
留: Stay. Accept. Preserve.
Meaning: The character '留' signifies staying, preserving, symbolizing permanence, cherishing, and reluctance to part.