Plus

<svg class="bi bi-plus" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" d="M8 3.5a.5.5 0 0 1 .5.5v4a.5.5 0 0 1-.5.5H4a.5.5 0 0 1 0-1h3.5V4a.5.5 0 0 1 .5-.5z"/>
  <path fill-rule="evenodd" d="M7.5 8a.5.5 0 0 1 .5-.5h4a.5.5 0 0 1 0 1H8.5V12a.5.5 0 0 1-1 0V8z"/>
</svg>