What is the term that describes a device's ability to amplify a signal?

"Gain" is the standard electronic term used to describe how much a device or circuit amplifies a signal. If an amplifier takes a small input signal and outputs a much larger one, it is said to have high gain. Gain can refer to an increase in voltage, current, or overall power. It is often expressed mathematically as a ratio of the output to the input, or measured on a logarithmic scale in decibels (dB). The other terms listed represent opposition or losses in a circuit, not amplification. "Forward voltage drop" is the voltage consumed by a conducting diode, while "forward resistance" and "on resistance" refer to the impedance that restricts current flow.