The top answer says that if you use DC current source, then the Q point is the "solution" of the circuit.
I interpret this as, if you use a DC current source of I amps, then the Q point will tell you what voltage will appear across the nonlinear device (e.g. diode)
But on this page, it says we can have multiple Q points, some are stable, some are unstable.
Can someone confirm my understanding of Q point and elaborate on the meaning of having multiple Q points?
Is quantum tunnel diode the only device having multiple Q points?