What is "nail bomb"

n. A bomb designed to cause extensive wounding by packing sharp objects around the explosive; used especially by terrorists and suicide bombers

The nail bomb is an anti-personnel explosive device packed with nails to increase its wounding ability. The nails act as shrapnel, leading almost certainly to greater loss of life and injury in inhabited areas than the explosives alone would. The nail bomb is also a type of flechette weapon. Such weapons use bits of shrapnel ( steel balls, nail heads, broken razors, darts and bits of metal) to produce a large radius of destruction.

Nail bombs are often used by terrorists, in particular by suicide bombers, since they cause large numbers of casualties when detonated in crowded places. Nail bombs can be detected via electromagnetic sensors and standard metal detectors.