If you are among those readers who have never noticed, I hide little
symbols like that in virtually all my comics for no good reason. The
current list is:
Olive Oyl (O2 - get it?)
Upside Down Bird
Arrow in the Back (Exceedingly Rare)
The number above the signature tells
you how many symbols to look for, a la Al Hirschfeld.
Aparently now being written by "Wayno."
Also note on Sunday, get the graphic from Seatle Pi.
It's clearer and they have a magnifier