For Joint Stereo we have a term and definition in Computer Technology.

Joint Stereo (an encoding option in the MPEG standard) looks at the two, stereo, channels and eliminates everything that is exactly identical. it is a mathematical trick to change left/right into mid/side, and which saves space, and it also eliminates things that sound identical on both channels (mid vs side rather than left vs right in this case, though). It also checks to make sure that using this method for each tiny chunk of the song (called frames) is better than the simple left-right method. There are times when left-right will sound better than mid-side, and so for these frames, a good Joint Stereo implementation will allow left-right frames to be used.
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