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A room-temperature electrical property of three-terminal ballistic junctions (TBJs) is predicted. For a symmetric TBJ, it is shown that when finite voltages V and -V are applied to the left and right branches, the voltage output V c from the central branch will always be negative. This characteristic appears even when the symmetry in the TBJ is broken, provided that |V| is larger than a threshold. Applications of these devices in nanoelectronics are proposed.