Penetrative Warhead

The so called penetrative warheads are essentially the eldest type of weapons in the universe. They differ little from stones launched from the slingshots. There is literally no 'explosive' element in them, instead the front part of the missile is created from the densest achievable matter. The rest are guidance systems and engine.
Penetrative Warheads are normally used for precise planetary bombardment. They can be fired even indirectly, circling around the planet few times to gather enough momentum. They hit the enemy with purely kinetic power. They can be summed up as MAW with guidance system.
There have no usage in fleet-to-fleet combat, due to being massively inferior in terms of damage to 'proper' ship-killing missiles.