Is it another euphemism for kassam?
I've been checking them out, and they are dangerous weapons, which can cause major damage and of course, death. In many articles, it does seem that kassams are different from mortar shells, even though other articles give the impression that they're all the same.
A mortar is a muzzle-loading indirect weapon that fires shells at low velocities,
short ranges, and high-arcing ballistic trajectories. It typically has a barrel
length less than 15 times its caliber. A mortar is relatively simple and easy to
operate. A modern mortar consists...
They are dangerous weapons, no matter what you call them. And don't forget that the Arab terrorists have them and use them against innocent Israeli civilians.