Literature Reference: 昨夜天月明，长川寒且清。—— 《杂曲歌辞 古别离二首 二》 Last night, the moon was bright, the long river cold and clear. Source from 'Zaqu Geci Gu Bieli Ershou Er'.
长: Strengths, merits.
川: The river flows ceaselessly. The character (字) is vast and potent, capable of triumphing over all things. It is the character of supreme fortune.
Meaning: Changchuan symbolizes a vast and eternal river, representing breadth, depth, and perpetuity.