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A graphical representation of the frequency response of a system used to predict stability. It plots the complex-valued transfer function as a function of frequency.

A graphical method for determining the stability of a closed-loop system by counting the number of clockwise encirclements of the critical point (-1,0j).

A measure of how much gain can increase before a system becomes unstable, obtained from the Nyquist plot as the inverse of the gain at the phase crossover frequency.

A measure from the Nyquist plot of how much additional phase lag at the gain crossover frequency would lead to instability.

The point in the Nyquist plot (-1,0j) around which the number of encirclements determines the stability of the closed-loop system.

The act of tracing the Nyquist plot around the critical point; can be clockwise or counterclockwise, indicating different implications for system stability.

A function that characterizes the input-output relationship of a system without feedback, used in generating the Nyquist plot.

A concept referring to whether a system with feedback tends to return to its equilibrium state after a disturbance, as analyzed by the Nyquist plot.

The contour in the complex plane used to trace the frequency response of the open-loop system and create the Nyquist plot.

Though not part of the Nyquist plot, it's a precursor that shows the gain and phase of a system as functions of frequency which can inform the Nyquist plot.

A quantitative measure of how close a system is to instability, such as gain margin or phase margin derived from the Nyquist plot.

A value of 's' for which the transfer function becomes infinite. Poles to the right of the imaginary axis in the complex plane imply system instability.

A value of 's' for which the transfer function becomes zero. Zeros affect the shape of the Nyquist plot but not directly the stability.

The frequency at which the magnitude of the transfer function equals one (0 dB). This frequency is critical for determining phase margin on the Nyquist plot.