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
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