Literature Reference: 怀瑾握瑜兮，穷不知所示。——《楚辞·九章·怀沙》 Holding precious jade, yet poor and not knowing how to show it. Source from 'Chu Ci: Huai Sha'.
函: The term refers to a letter and its envelope.
瑜:
The radiance of jade, auspiciousness and well-being, grace and composure.
Meaning: Carrying precious jade, symbolizing outstanding talent and noble character.