Is there some hypernym word (or phrase) for "input" and "output"?
Like "sibling" for "brother" and "sister", or "parent" for "mother" and "father"?
In a context of electric schemes.
a term used to collectively refer to input and output. Synonym: input/output I/O
However: This term is rarely used. Use other terms that are more specific to your context instead like signal or data.
I would actually think of the commonly used input/output, or I/O .
Transput may be recognized by some, but I can assure you that plenty of people will not immediately grasp its meaning.
I do admit it is not very original :)
In electrical terms, or at least electrical engineering, a proper term is signal.