禅: Abdication and transmission.
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: The character 'Chan' embodies wisdom and tranquility, while 'Du' represents resilience and steadiness. Together, they convey a sense of calm and depth.