depends on what you meen?
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Most of the bombs in World War I and II were encased in iron or steel. They were shaped somewhat like a bullet with fins to allow them to drop straight down.
the planes were the bombs and the terrorist wore fake bombs as a while on the plane
No set appearance. Work in bomb disposal would be much easier if there were.
See the link below for images of the FIRST atomic (nuclear) bombs.
a stick of bombs