screen: what is the naming scheme (exact) for ASUS monitors?

ASUS monitors have names like "MG28UQ" or "PA27AC".

I do not even know exactly what the name is. Obviously, the length of the diagonal is there, a two-digit number in inches.

Can someone explain the meaning of the prefix and suffix parts of the naming scheme (before and after the diagonal length)?

PS This question is similar to:

What is the (exact) naming scheme for Dell monitors?

but for ASUS instead of Dell.