Uhm, obviously the female symbol for Amiga is a boob. A chequered white and red boob, bouncing
Seriously though, I'd vote for that photo scan of the chick with the fruit hat, delicious lipstick and a pencil in her mouth (from Digisomething video capture thingy demo disc). Had a crush on her at the time, saw it on A1000. Sort of like "how can anyone be that beautiful??"