Full Idea
The designation of a single object can also consist of several words or other signs. For brevity, let every such designation be called a proper name.
Gist of Idea
We can treat designation by a few words as a proper name
Source
Gottlob Frege (On Sense and Reference [1892]), quoted by Bernard Linsky - Quantification and Descriptions 1
Book Reference
'Bloomsbury Companion to Philosophical Logic', ed/tr. Horsten,L/Pettigrew,R [Bloomsbury 2014], p.79
A Reaction
Frege regards names and descriptions as in the same class. Russell, and then Kripke, had things to say about that.