:before { content: fa-content($fa-var-yen-sign); }  .#{$fa-css-prefix}.#{$fa-css-prefix}-rub:before { content: fa-content($fa-var-ruble-sign); }  .#{$fa-css-prefix}.#{$fa-css-prefix}-ruble:before { content: fa-content($fa-var-ruble-sign); }  .#{$fa-css-prefix}.#{$fa-css-prefix}-r