From least shine to most shine the sheens should be in the following order:
Flat (no shine at all)
Matte
Satin
Semi Gloss
Gloss (very shinny)
But as Sheep pointed out, some companies consider Satin and Semi Gloss to be the same thing. The point is that it's like ordering a large shirt from two companies. One company might give you a large shirt that is too small for you and the other company may give you a large shirt that is so big, you are swimming in it. Not all companies use the same standards.