IED stands for "Improvised Explosive Device", referring to a homemade bomb constructed and deployed in unconventional ways.
Other common meanings of IED include:
1. IED - Institute of Education (various countries)
2. IED - Instituto Europeo di Design (European Design Institute)
3. IED - Intelligent Electronic Device (in power systems)
4. IED - Intermittent Explosive Disorder (a psychological condition)