I checked your code in my install. It works, except that you made a typo (missing backslash):
[icon]cog[/icon]
Few notes:
-
You must make sure to enqueue the Font Awsesome stylesheet.
-
You must close the shortcode, like:
[icon]cog[/icon] -
Remember to escape the class name with
esc_attr(). -
Another shortcode idea:
[fa icon="cog"]
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