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the answer is audio input/ output
Usually used as a floppy drive interface.
TRS is the name of the type of connector (e.g. 1/4"/6.3mm jack) and speaker cable is exactly what it is, speaker cable.
Because Jesus wanted it that way.
A 3.5 MM stereo mini phone plug is normally used for headphones connectors. Which is a version of the TRS connector (tip, ring, and sleeve).