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A peer or buddy is a cell that shares one or more houses with another cell.
In standard Sudoku, each cell has 20 peers—3 houses (box / column / row) each containing 8 peers, less 4 that overlap: ((3 x 8) - 4) = 20. This image shows the peers of r5c5:
Peers play an important role in solving techniques, because peers cannot contain the same digit.
Another way of saying that cells X and Y are peers is to say "X sees (or intersects) Y".