The relation verb ‘refers’ is being used in its broad sense (loosely “is about”) and not as a synonym for ‘names’ in the sense of “is a name of”.
George Boole (1815–1864) introduced this principle into modern logic: Even though he changed from a monistic fixed-universe framework in his 1840s writings to a pluralistic multiple-universe framework in 1854,[1] he never wavered in his frank avowal of the principle of wholistic reference.
For Boole, the essential first step in the process of conceiving of a proposition preliminary to making a judgement of its truth or falsity – or even using it in a deduction, however hypothetically – was to conceive of the universe of discourse.
[2] One statement of his principle is in the sentence immediately following his definition of universe of discourse, which is his first use of the expression 'universe of discourse' and probably the first in the history of the English language.
Some recent formulations of standard one-sorted first-order logic seem to be in accord with a form of it, if they do not actually imply the principle itself.