From the “it sounds dirty, but it’s not” file, I’m please to introduce you to the long-rod penetrator.
According to the Wikipedia, it’s one type of kinetic energy penetrator, which itself should be another entry in the “sounds dirty” file:
A kinetic energy penetrator … is a type of ammunition which, like a bullet, does not contain explosives and uses kinetic energy to penetrate the target.
The term can apply to any type of armour-piercing shot but typically refers to a modern type of armour piercing weapon, the armour-piercing fin-stabilized discarding sabot (APFSDS), a type of long-rod penetrator (LRP)
Despite the fancy-sounding technical description, I still giggle inside.