Literature Reference: 从容静塞尘。——《奉送严公入朝十韵》杜甫 Gracefully calming the dust of the frontier. Source from 'Fengsong Yangong Ruchao Shi Yun' by Du Fu.
塞: The fortress, the frontier stronghold.
尘: Dust and loess.
Meaning: Dust of the frontier symbolizes peace and stability brought to the borderlands.