A system that does NOT allow exchange of heat with its surrounding is called

An adiabatic system is a thermodynamic system that is thermally insulated from its surroundings, meaning no heat (Q = 0) is exchanged between the system and its surroundings. In an adiabatic process, the change in internal energy equals the negative of work done by the system (ΔU = −W). Examples include rapid compression or expansion of a gas in an insulated container. This is distinct from isothermal (constant temperature), isobaric (constant pressure), and isochoric (constant volume) processes.