Literature Reference: 上帝配食，单于入臣。—— 《郊庙歌辞 享太庙乐章 崇德舞》 God is honored with offerings, and the Chanyu submits as a vassal. Source from 'Jiaomiao Geci: Xiang Tai Miao Yue Zhang Chong De Wu'.
入: Enter, and step into the dream. Fit, just perfectly so.
臣: The term commonly used in monarchical states to refer to officials. It is also used by officials as a humble self-reference when addressing the monarch, and serves as a modest form of self-designation among the ancients.
Meaning: To submit as a vassal signifies loyalty and humility.