This is from a humanoid animator that I bought:

This is from a different asset pack:

I am very curious. What does SM mean?
This is from a humanoid animator that I bought:

This is from a different asset pack:

I am very curious. What does SM mean?
For the first image it’s most likely “state machine” since they’re a key component of Mechanim.
https://docs.unity3d.com/Manual/StateMachineBasics.html
For the second image it’s most likely “static mesh”. Once your project grows past a certain size having naming and folder layout guidelines can help sort and find your files. Below is a link to the naming guidelines that are used by Epic Games which is where the “SM” was most likely taken from.
https://wiki.unrealengine.com/Assets_Naming_Convention
Edit: Swapped the above link with the official guidelines page. It has proper tables making it less of a mess to read.
@Ryiah
Thanks. That makes sense now.