It's called a sleeper pin.
Second Response:
The pin is called a sleeper, because it is hidden from view by a pin directly in front of it in your line of sight. The 5 pin is the sleeper behind the 1 pin. The 8 pin is the sleeper behind the 2 pin. The 9 pin is the sleeper behind the 3 pin.
7...8...9...10
..4...5...6
.... 2...3
.......1
Barmaid is when any one pin hidden behind another. This is also referred to as a sleeper.
Behind the door lies a hidden room called the underwater room in club penguin. Many girl penguins like to play "mermaids" in this room. There is also a pin in here called "moss key'' pin.
hidden lake
The Sombrero Pin was an old pin that was available during the Winter Fiesta 2008. It was hidden at the Forest.
it is the slead pin
tropical bird pin in the gift shop until Aug 11 2011
Pins are hidden in different rooms. There's a new pin hidden every few weeks. 8-P
the pin is hidden on the top of the lighthouse. u will see it
a pin
upstairs in the sky lodge
you get the pin that is by the clam
It is in the gift shop.