Literature Reference: 煮玉矜新法，留符识旧仙。—— 《酬前驾部员外郎苗发》 Boiling jade with new methods, leaving talismans to recognize the old immortals. Source from 'Chou Qian Jiabu Yuanwailang Miao Fa'.
留: Stay. Accept. Preserve.
符: Surname. Mark, symbol.
Meaning: Leaving talismans symbolizes a connection with immortals and mystical power.