All icon sets are welcome., but normally these were defined as icons and not as pictograms. Are you busy? Well, let's solve some doubts:
Un icon is a sign that schematically represents a symbol, real object, or figure.
It is the name with which the signs of the alphabetic systems based on significant drawings are called.
Now it is easier to understand why an icon is not the same as a pictogram, and above you can see that they can be useful to use depending on which website we are designing.
They come in SVG and .AI formats for Illustrator, and are free for personal use, pero not commercial.
Download | Pictoic
Source | WebResourcesDepot