Test with the FontAwesome font. This is a broken way to use icons, but unfortunately, many webmasters do that.

U+F00x: 

U+F01x: 

U+F02x: 

U+F03x: 

U+F04x: 

U+F05x: 

U+F06x: 

U+F07x: 

U+F08x: 

U+F09x: 

U+F0Ax: 

U+F0Bx: 

U+F0Cx: 

U+F0Dx: 

U+F0Ex: 

U+F0Fx: 