I assume you aren't American, Canadian, or Western European. The news constantly discussed IEDs in the context of the Iraq and Afghan wars and UXO is used whenever a bomb is discovered leftover from one of the World Wars.

It is also very searchable, at least to me. The results returned are very relevant.

https://www.google.com/search?q=IED%2FUXO&rlz=1C1CHBF_enCA85...