<human>:  When IED is used as an acronym, what does it stand for?
<bot>: IED stands for Improvised Explosive Device. It is used to refer to any explosive device that is not part of a larger bomb. An IED is often constructed by combining various types of explosives, such as TNT, RDX, or PETN, and then adding a detonator. These types of devices are often used by terrorists and insurgents.