It is generally acknowledged that the red tulip is a symbol for PD. But the U.S. doesn't have one symbol representing all PWP.
Karen Painter, a young-onset PWP from washington state created a beautiful tulip design. (below)
There is a grassroots effort now to spread this graphic far and wide in the hopes that one day it will represent all pwp. Some PD orgs are having lapel pins made for their members. Other orgs are using it on their websites, and for flyers for upcoming events.
If you'd like a copy of the graphic to use for PD flyers or events or websites, let me know, and I'll send you one to use.
Best, Jean