In military jargon, unexploded ordnance (UXO) refers to military ammunition or explosive devices that do not detonate even after being primed and launched. 

Such unexploded ordnance (UXO) can be the byproduct of a war, a military battle inoculation practice, field firing drills, or even military scrap, which is frequently transferred from one nation to another in order to extract metal. 

Until proven differently by professional assessment by military ammunition experts, all unexploded munitions are considered potentially dangerous and capable of detonating. 

An improvised explosive device (IED) can be made from unexploded ordnance, such as the artillery shell discovered close to the Punjab chief minister’s residence.