$tool-toggle-down-glyph: dynamic($fa-var-chevron-down $tool-glyph-font-size $font-icon-font-family);$tool-expand-bottom-glyph: dynamic($fa-var-caret-down $tool-glyph-font-size $font-icon-font-family);$tool-collapse-left-glyph: dynamic($fa-var-caret-left $tool-glyph-font-size $font-icon-font-family);