Let us check its evolution history (image get from http://www.vividict.com/)
|Learn one Chinese Character a day - 株|
株 means trunk of a tree,
and it was later used as Chinese Classifier (https://en.wikipedia.org/wiki/Chinese_classifier) for objects like tree. One usage literally is: one 株 tree.
Now let us enjoy a Chinese calligraphy with 株 inside: