What (FontAwesome) icon should I use for count operation? [closed]

1. What is the difference between FAS and fa in Font Awesome?
2. How do I use Font Awesome OTF?
3. What is fa FW in Font Awesome?

What is the difference between FAS and fa in Font Awesome?

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.

How do I use Font Awesome OTF?

Just double click on FontAwesome. otf (Open type font file) or right click then click on open. Then click on Install Button.

What is fa FW in Font Awesome?

The fa-fw class is used to set icons at a fixed width. This class is useful when different icon widths throw off alignment.