Its chemical formula is hard to spell: Cyclotrimethylenetrinitramine. But the military have a simple name for it and one that’s easy to remember: RDX. And it was RDX that was found by forensic experts at the site of the deadly Jakarta Stock Exchange bombing, according to police spokesman Dadang Garnida.

Royal Demolition Explosive—RDX—is an explosive substance which has been used since World War II. And it is lethal. As a weapon