Literature Reference: 徒言玉节将分阃，定是沙隄欲到门。——《胡二十拜户部兼判度支》 As the jade token is about to divide the gate, surely the sandbank will reach the door. From 'Hu Ershi Bai Hu Bu Jian Pan Du Zhi'.
沙: Sand, grains of sand.
隄: Synonymous with "dike" or "embankment".
Meaning: The sandbank symbolizes stability and steadfastness, implying firmness as a rock and steadiness as a mountain.