Mixer

In telecommunication, a mixer is a nonlinear circuit or device that accepts as its input two different frequencies and presents at its output (a) a signal equal in frequency to the sum of the frequencies of the input signals, (b) a signal equal in frequency to the difference between the frequencies of the input signals, and, if they are not filtered out, (c) the original input frequencies.

Source: from Federal Standard 1037C

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In beverage preperation, a mixer is a drink (usually non-alcoholic) that is mixed with another in the hope that the result is more palatable.