Yes, Sandy, believe there is. Think at the Theatre, starts counting from the right, as you look at the stage. So that would be the right armrest all the way. The lucky person at the left end gets two!
Just at a concert this arvo, had woman to my right wanting to take 'all' of my right (her left) armrest. I explained the 'protocol' to her & she moved her arm.
Interesting if get a left handed person! Hopefully it gets sorted!