My guess us that fewer than 1% of native speakers know that term, but it must have some usefulness or why invent it?
"John asked Mary to wash him."
We can say there is some ambiguity there, but there isn't. Why? Context will always tell us what is meant by that.
"He asked Mary to wash John.'
No native speaker will be confused by that. "He" and "John" are clearly not the same person.
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