To implement on your site you can use the fontawesome that today I believe to be the most complete: link
After download just add on your site like this:
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
Someone knows the source that this site uses.
There is no way to tell if you do not know what the site is, after all sources can be created by independent people, drawn on AdodeIllustrator, but there is a way to find out using Chrome or Opera:
Seethatontherightsidethepropertyfont:
(orfont-family
)willhavethenameofthesourceused,sojust"googlar" the name of the source, if it is in the interet it is probably there for download, is because the source was created by the site developer and you can not download it (you can even copy from the website you entered, but there may be some licensing implication, however this is not the focus of the conversation).
Note: Looking at their source code I could see that they might have used this tool link to generate the custom font.