• First line (the brief description) must only be one sentence and
  should start with a capital letter unless it starts with a lowercase
  symbol or identifier. Don't use a trailing period either. Don't exceed
  72 characters.

Icon sets, such as, Font Awesome, Glyphicons, or Google Fonts, commonly use the <i> tag.

One reason is that <i> is shorter than <span>.

Another reason is that the letter i can also stand for 'icon'.

Technically, either the <i> or the <span> tag can be used to render icons.

A twitter icon by Font Awesome created with the <i> tag.

<i class="fab fa-twitter"></i>

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