Yes, they do have a signature sword, but if they have a distinctive knife it's news to me.
if i am not mistaken i think that thier knife is called a pakal fighter and zach whitson knows a hell of alot about pekiti. he owns iron mountain knives so check him out tell him i sent you.
later
Jason Arnold
Parker/Planas Lineage
CANADA
I do not believe that PTK has a signature knife.