Question about a certain texture

I am still quite new to learn how Unreal Engine works. I have already done some projects of mine to just try to learn how the game engine works. So, on a specific project that I am working on, I have downloaded some assets through UE Marketplace. And when I entered to my project and check the asset, I have noticed over at the texture files there is a Texture file that have a name with “SS” on it. And I have never seen a texture have that name with a “SS” to it.

To mark the ones that I mean, I have circled them with red.

Once again, never seen a texture with that kind of name before. So does anyone know what the SS stands for?

Because I know the RMA, NRM and ALB stands for. I just haven’t seen that texture with a SS on it

Texture_UE_Closer
(This is a closer look on the texture with those SS in it)

Subsurface Scattering, I’m guessing