Res communes
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In the civil law. Things common to all; that is, those things which are used and enjoyed by every one, even in single parts, but can never be exclusively acquired as a whole, e. g., light and air.
Inst. 2, 1, 1; Mackeld. Rom. Caw, § 169.