With the Asus N550J I bought, I received an adapter which has a tiny clip attached to it:
As it seems, the exact same cable fits perfectly in that clip, as shown below:
On this page some usages are shown, but I'm not convinced that these are why they're present. The second usage for example shows you how you can use the clip for some 'stress lessening', but I don't see how this would work, as the clip is quite rigid.
What is the purpose of these clips?