For example, how are the classes "fa-square-o" and "fa-square" different from each other? Where can I find more information on font-awesome class name conventions? I searched on their website, but couldn't find specific guidance on font-awesome class naming conventions.
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It means outlined. Some icons have full solid backgrounds, and some others are just outlined, and are named with an extra -o
at the end of their names. Besides this, there'a also -alt
, which is used for icons which are alternatives to other icons. E.g., the icon fa-arrows
, has an alternative fa-arrows-alt
which has a slight rotation, different from the normal icon. I guess these two are the only ones to be mentioned.

Amar Syla
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1Could you please provide a link, if you know of one, to the part of the documentation on Font Awesome's website where it explains this. – user2407334 Nov 05 '15 at 19:23
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@user2407334 I don't have any, because even I didn't read it anywhere. It's just obvious. – Amar Syla Nov 05 '15 at 19:32