Literature Reference: 若念西河旧交友，鱼符应许出函关。—— 《道一大尹存之庭美二学士简于圣明自致霄汉皆与舍弟昔年还往牧支离穷悴窃于一麾书美歌诗兼自言志因成长句四韵呈上三君子》 If you remember old friends from Xihe, the fish tally should allow passage through Hangu Pass. Source from 'Daoyi Dayin Cunzhi Tingmei Er Xueshi Jian Yu Shengming Zi Zhi Xiaohan Jie Yu She Di Xi Nian Huanwang Mu Zhi Li Qiong Cui Qie Yu Yi Hui Shu Mei Ge Shi Jian Yan Zhi Yin Cheng Changju Si Yun Cheng Shang San Junzi' by Du Mu.
鱼:
Fish. When used in a name, it symbolizes a bright future and carries the meaning of prosperity and auspiciousness.
符: Surname. Mark, symbol.
Meaning: The fish tally, an ancient symbol of official identity, represents trust and authority.