High-explosive squash head

A high-explosive squash head (HESH), in British terminology, or a high-explosive plastic/plasticized (HEP), in US-American terminology, is a type of explosive projectile with plastic explosive that conforms to the surface of a target before detonating, which improves the transfer of explosive energy to the target. Squash head projectiles are similar to high-explosive projectiles and are well suited to many of the same targets.

Source: Wikipedia — High-explosive squash head (CC BY-SA 4.0)