Instrumentation amplifier

An instrumentation amplifier (sometimes shorthanded as in-amp or InAmp) is a precision differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. Additional characteristics include very low DC offset, low drift, low noise, very high open-loop gain, very high common-mode rejection ratio, and very high input impedances.

Source: Wikipedia — Instrumentation amplifier (CC BY-SA 4.0)