If you're going to use a string_view to refer to the contents of an std::string, then you already need to make sure that the string doesn't change too much. So you wouldn't use a trigraph '&&&' reference to refer to a string if either:
a) You've already stored the value of c_str()
b) You're going to plunder the string's resources
The fact you don't have a better name for it than "trigraph reference" is telling.
I can imagine the conversations now:
"So what is this ugly &&& thing?"
"It's a trigraph reference"
"erm, ok ... so what does it do?"
"it's a qualifier composed of three characters."
"ok, but what does it mean?"
"it's like && but 50% more."