Cikonss is a one more step further in icon usage as it uses no fonts but the items are created with pure CSS. With icon-fonts, it became clear that, soon, we’ll no longer be using any images for icons.
Currently, there are 40+ items in the set, they are responsive-layouts-friendly and work cross-browser (no CSS3 properties are used).
The set is currently not big enough to be used in web applications but if you need only few of them, than why not.
And, if the set keeps growing, it can become a valuable resource for the web design community.