Literature Reference: 桦，木也，坚韧不拔；恒，久也，持之以恒。—— 《礼记·中庸》 Hua, a tree, symbolizes resilience; Heng, perseverance, signifies steadfastness. Source from 'The Doctrine of the Mean'.
桦: The tree species, birch. "Birch" symbolizes the toughness akin to a tree, unyielding to wind and rain, metaphorically representing a robust physique conducive to good health.
恒: Eternity, unwavering perseverance.
Meaning: Like a birch tree, resilient and unwavering, symbolizing strength and perseverance.