Yes, you got it right!
It’s the Akatsuki emblem.
For enlightenment, Akatsuki is an organized group of Class-S and Rogue Ninjas in the Naruto world. They wear black cloaks with red clouds as their uniforms, hence the name “Akatsuki cloud”.
The Akatsuki clouds have become really popular to the fans of Naruto. A lot of them buy black t-shirts, scarfs, cups and other things with red clouds on, just to show their affection toward the ravenous Ninjas.
This simple piece of art represents a country that is forever drenched in rain and bloodshed, Amegakure, the Village Hidden in the Rain.
Wait! Why do I even bother explaining all this sh*t?