valley point (1) (of a programmable unijunction transistor characteristic)

The point on the current-voltage characteristic corresponding to the second lowest current at which dv_AK/di_A = 0 when the gate is biased from a resistive voltage divider.

(2) (of a unijunction transistor characteristic): The point on the emitter current-voltage characteristic corresponding to the second lowest current at which dv_EB1/di_E = 0.