Literature Reference: 夕惕司龙契，晨兢当凤扆。——《郊庙歌辞 武后大享拜洛乐章 德和》 At dusk, vigilance aligns with the dragon's covenant; at dawn, diligence meets the phoenix's throne. Source from 'Jiao Miao Ge Ci Wu Hou Da Xiang Bai Luo Yue Zhang De He'.
夕: Dusk, evening. Surname.
惕: Vigilance, cautious and prudent: be alert and wary.
Meaning: Vigilance at dusk symbolizes constant caution and unwavering diligence.