Rocket pods

[thatguy96]

I'm curious as to what exactly the 2x or 4x and the ammo loadout for rocket pods represents.

Say, for instance, we're talking about a weapon that is 2x70mm Rockets with an HE ammo of 9. Is 2 supposed to represent the number of rockets per salvo and then the HE ammo is number of salvos?

I'm just having a slightly difficult time decifering how these numbers reflect RL loadouts.

Thanks for the help in advance.