This new fan design implements dimples in the fan blades similar to a golf ball which is supposed to reduce fan noise. Here's a snip:

"Up for review today is Sharkoon's new Silent Eagle 2000 Fan. What is the fancy name all about and how is this "silent" fan different from many other silent fans on the market? In a word... dimples. The Silent Eagle line of fans from Sharkoon feature a new fan-blade design similar to that of a golf ball. Let's see if this new fan design really makes a difference."



Link: Pimprig