html - How does "/f179" relate to twitter's little bird icon? -

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if inspect on little bird icon on twitter.com see css has content: "/f179". twitter's icon? special font lots of special characters including twitter's icon?

please use below code:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css">

add above link in head section of page , following code use twitter icon on page..

<i class="fa fa-twitter" aria-hidden="true"></i>

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