feather/icons/underline.svg

<svg
  xmlns="http://www.w3.org/2000/svg"
  width="24"
  height="24"
  viewBox="0 0 24 24"
  fill="none"
  stroke="currentColor"
  stroke-width="2"
  stroke-linecap="round"
  stroke-linejoin="round"
>
  <path d="M6 3v7a6 6 0 0 0 6 6 6 6 0 0 0 6-6V3" />
  <line x1="4" y1="21" x2="20" y2="21" />
</svg>