discourse/app/assets/stylesheets/vendor/font_awesome/_path.scss

/* FONT PATH
 * -------------------------- */

@font-face {
  font-family: 'FontAwesome';
  src: url('#{$fa-font-path}/fontawesome-webfont.woff2?v=#{$fa-version}') format('woff2'),
       url('#{$fa-font-path}/fontawesome-webfont.woff?v=#{$fa-version}') format('woff');
    // the below are for really ancient browsers such as IE9 and earlier, and I think can be removed
    //url('#{$fa-font-path}/fontawesome-webfont.ttf?v=#{$fa-version}') format('truetype'),
    //url('#{$fa-font-path}/fontawesome-webfont.svg?v=#{$fa-version}#fontawesomeregular') format('svg'),
    //url('#{$fa-font-path}/fontawesome-webfont.eot?#iefix&v=#{$fa-version}') format('embedded-opentype'),
//  src: url('#{$fa-font-path}/FontAwesome.otf') format('opentype'); // used when developing fonts
}