Its called A tactical nuclear weapon (or TNW) refers to a nuclear weapon which is designed to be used on a battlefield in military situations. This is as opposed to strategic nuclear weapons which are designed to menace large populations, to damage the enemy's ability to wage war, or for general deterrence.
he W33 was an American nuclear artillery shell, fired from an 8 inch (203 mm) M110 howitzer.
There were a total of 2,000 W33 shells produced. It was first produced in 1957 and saw service until 1992. The warhead used oralloy as its nuclear fissile material and could be used in two different yield configurations. This required the assembly and insertion of different pits, with the amount of fissile materials used controlling whether the destructive yield was low or high. The highest yield version of the W33 may have been a boosted fission weapon.