system-uicons/src/images/icons/warning_triangle.svg

<svg height="21" viewBox="0 0 21 21" width="21" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd" transform="translate(1 1)"><path d="m9.5.5 9 16h-18z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/><path d="m9.5 10.5v-5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/><circle cx="9.5" cy="13.5" fill="currentColor" r="1"/></g></svg>