On the Font Awesome icons page, some icons are listed with (alias) after them. What does that mean?
Instead of fa as a style preceding every icon style, you need to pick from fas for solid, far for regular, fal for light, or fab for brand. It looks like fas is the fallback, so you get solid if you leave your old fa references. For most icons, this change makes the icon heavier or lighter.
Begin with the icon class “fa-open” followed by an equal sign “=” and then the alternate text “Screen Reader Text”.
It is because they are both inline elements. <i> is shorter to type than <span> and the icon won't get rendered in italics.
Font Awesome is fully open source and is GPL friendly. You can use it for commercial projects, open source projects, or really just about whatever you want.
The (Alias) means that there is more than one name for the font icon. For Example, icon-dollar is also icon-usd.
EDIT: It is probably best to use the default name rather than the alias name if you don't know which to use. Further, as the comment below states, use the name that best fits you activity or function.
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