Traditio brevi manu
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A species of constructive or implied delivery. When he who already holds possession of a thing in another's name agrees with that other that thenceforth he shall possess it in his own name, in this case a delivery and redelivery are not necessary. And this species of delivery is termed "traditio brevi manu."
Mackeld. Rom. Law, § 284.