Professional Scrum – Professional meaning what…?

In my pursuit of raising my understanding of Scrum in order to serve my partners better, I recently attended both Professional Scrum Master I and II trainings and a Professional Scrum Master Train-the-trainer.
One of the many A-HA moments I experienced during these very intense days was the deeper meaning behind “professional” in the title of the training. Before that moment it was just a title as any other. Professional, or Certified, hey, what’s in a name…