+ 2
Its an icon library that have many icons which you can use in your code, it is helpful since you don't need to go through the trouble of searching and downloading the icons then use image or svg to include them, instead you just include them by name
+ 1
It's a font that uses ligatures feature to allow you to replace certain text with various symbols.
It's best to just DuckDuckGo it (or Google if you're casual (jk)) and see for yourself, they provide guides on how to use them on their site.
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