Hot Hardware published a review on the Intel Unleashes Onslaught Of Skylake CPUs For Next Gen Notebooks, Convertibles And Compute Sticks A quote from the article:

Intel is following up on its Skylake bonanza by opening the floodgates on at least two dozen SKUs mostly covering the mobile sector. The company is divvying up the range into four distinct series.

There's the Y-Series, which is dedicated to 2-in-1 convertibles, tablets, and Intel's new Compute Stick venture. Then there's the U-Series, which is aimed at thin and light notebooks and ?portable? all-in-one machines. The H-Series has its sights set on gaming notebooks and mobile workstations, while the S-Series is designated for desktops, all-in-one machines, and mini PCs.

 Intel Unleashes Onslaught Of Skylake CPUs For Next Gen Notebooks, Convertibles And Compute Sticks @ HotHardware