UXO
A hydrogen bomb was tested in the 1950s but there have never been any dropped in aggression. In fact no nuclear bombs have been used in action since the atomic bombs were dropped on the Japanese in World War 2.
The land ordinance of 1785 was created to divide the land that had been acquired by the U.S..
Those are the only two that have been dropped in a combat situation.
To date, only two atomic bombs have been dropped. The locations were the Japanese cities of Hiroshima and Nagasaki.
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That is the definition of "unexploded ordinance"(UXO, sometimes abbreviated as UO). Sometimes UXO is also simply called unexploded bombs (UXBs), or explosive remnants of war (ERW)
UXO
It is a dud.
UXO
That is a UXO- Unexploded Ordnance.
It is commonly known as a dud or an unexploded shell.
Both. After World War 2 a significant number of bombs dropped by both sides were found unexploded. They were considered live and dangerous and professionals had the job of defusing them at the risk of their lives. Neither side intended for this too happen. On the other hand, Mine fields were used for various reasons to create areas hazardous to enemy soldiers. Some of them still exist in Africa and Asia and present a hazard to local inhabitants.
Both. After World War 2 a significant number of bombs dropped by both sides were found unexploded. They were considered live and dangerous and professionals had the job of defusing them at the risk of their lives. Neither side intended for this too happen. On the other hand, Mine fields were used for various reasons to create areas hazardous to enemy soldiers. Some of them still exist in Africa and Asia and present a hazard to local inhabitants.