Referring to glyphs by codepints (eg. \uf00c) in your scripts or shell configuration it's not recommended because icon fonts like Font Awesome use code points ranges those ranges are not disciplined by the unicode consortium, every font can associate every glyphs to those codepoints. This means that Font Awesome can choose to move glyphs around freely, today \uf00c is associated to the check symbol, tomorrow it can be associated to something else. Moreover, more than one icon font can use the same codepoint for different glyphs and if we want to use them both we need to move one of them. So, if you use a codepoint to refer to a glyph after an update that codepoint can point to another glyph. To avoid this situation you can use the font maps in the ./build directory, font maps are scripts which define shell variables that give names to glyphs, by sourcing those files in your shell you can refer to glyphs by name (eg. $CODEPOINT_OF_AWESOME_CHECK).