Literature Reference: 沛然莫之能御。——《孟子·梁惠王上》；筠，竹也。——《说文解字》 The force is overwhelming and cannot be resisted. Source from 'Mencius: King Hui of Liang'; Yun refers to bamboo. Source from 'Shuowen Jiezi'.
沛: Describing abundance and prosperity.
筠: Graceful in demeanor, resolute and persevering.
Meaning: Pei signifies abundance and vigor, while Yun represents bamboo, symbolizing resilience and nobility.