Do you need a lovely ☎ icon for your website? Before resorting to
FontAwesome have a look at what's
already available in HTML 5. Even more options are searchable at
amp-what, but remember to check that they are supported in the browsers you require. FontAwesome has the advantage of working anywhere, but it does need an extra download. So, for common icons like π or a strange 𝔊𝔬𝔱𝔥𝔦𝔠 style font, it's worth having a look at HTML5 first.
Footnote
Blogger is converting the icons in this article so they aren't easy to identify in the source. Here's some of what I've used:
☎ :
☎
π :
π
𝔊 :
𝔊