What is an Unexploded Ordnance (UXO)?

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What is an Unexploded Ordnance (UXO)?

A military ammunition or explosive device that remains unexploded even after it has been primed and fired is known as Unexploded Ordnance (UXO) in military parlance.
Such UXO can be left-overs from a war, a military battle inoculation exercise, field firing exercises or even be part of military scrap that is often exported from one country to another to extract metal.
All unexploded munitions are treated as potentially dangerous and capable of detonating till proven otherwise by professional assessment by military ammunition experts.
Unexploded ordnance such as the artillery shell found near the Punjab CM’s residence can be used as an Improvised Explosive Device.

Q1) What is pyrotechnic substance?

A pyrotechnic substance is a substance or mixture of substances designed to produce an effect by heat, light, sound, gas or smoke or a combination of these as the result of non-detonative self-sustaining exothermic chemical reactions.

Source: Bombshell found near Punjab CM house: What is unexploded ordnance, how does it fall into civilian hands