North Korea H-Nuclear warhead.

This is the H-Nuclear bomb which will be put in a ballistic warhead.  H-Nuclear bomb is the most powerful bomb so far on earth.  The Hydrogen bomb which was recently tested by NK was 10x more powerful than the atomic bomb dropped in Japan.

H-Nuclear bomb is a high technological bomb because it has to go through a fission-fusion-fission process to achieve the maximum explosion.  In a nutshell, a small atomic bomb (fission-split atoms) has to be ignited to achieve a high temperature of a few thousands degree for fusion (merge atoms) to take place before it eventually explodes again(split atoms) for maximum damage.

The diagram on the top left corner of the picture depicts the H-Nuclear bomb warhead.