紫: Represents a person of authority and prestige.
杜: Du Kang, Du Fu. The character "Du" refers to the sweet pear tree, as stated in the "Shuowen Jiezi" dictionary: "The male is called 'Tang', and the female is called 'Du'."
Meaning: Purple symbolizes nobility, and Du represents the resilient wood, signifying noble resilience and exceptional talent.