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

<svg height="21" viewBox="0 0 21 21" width="21" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"><path d="m10.5 8v-5.5"/><path d="m10.5 18.5v-5.5"/><circle cx="10.5" cy="10.5" r="2.5"/></g></svg>