| Unexploded ordnance (or UXOs) are explosive weapons (bombs, shells, grenades, etc.) that did not explode when they were employed, and still pose a risk of detonation, decades after the battles in which they were used. |
| •owl:Thing |
| •SpatioTemporalThing |
| •Perdurant |
| •Event |
| •Phenomenon |
| •HazardousPhenomenon |
| •ManMadeHazard |
| •WeaponRelatedHazard |
| •UnexplodedOrdnance |