I wouldn't call it an outlet, no.

https://dictionary.cambridge.org/dictionary/english/outlet
"a way, especially a pipe or hole, for liquid or gas to go out:
a waste water outlet
an outlet pipe"

https://simple.wikipedia.org/wiki/Electrical_outlet

... it is neither of these things.

Out*put* would be fine for Terminalabgang, but:

Terminalabgang / Terminal output is a functional description, not a part description.

If you want a part description (product description), well, it looks like a jack (I think connector or adapter would also be fine), and you can insert "output" to match Abgang.