What is Leftover nuclear weapons from the Cold War that are sold on the black market are called?

Leftover nuclear weapons from the Cold War that are sold on the black market are often referred to as "loose nukes." This term describes both the actual nuclear weapons and the materials or components that can be used to create them. The proliferation of such weapons poses significant security risks as they can fall into the hands of terrorist groups or rogue states. Efforts continue globally to secure and dismantle these weapons to prevent their illicit trade.