bootstrap-icons/icons/arrows-collapse-vertical.svg

<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrows-collapse-vertical" viewBox="0 0 16 16">
  <path d="M8 15a.5.5 0 0 1-.5-.5v-13a.5.5 0 0 1 1 0v13a.5.5 0 0 1-.5.5M0 8a.5.5 0 0 1 .5-.5h3.793L3.146 6.354a.5.5 0 1 1 .708-.708l2 2a.5.5 0 0 1 0 .708l-2 2a.5.5 0 0 1-.708-.708L4.293 8.5H.5A.5.5 0 0 1 0 8m11.707.5 1.147 1.146a.5.5 0 0 1-.708.708l-2-2a.5.5 0 0 1 0-.708l2-2a.5.5 0 0 1 .708.708L11.707 7.5H15.5a.5.5 0 0 1 0 1z"/>
</svg>