kibana-123/ui_framework/doc_site/src/views/button/button_with_icon.html

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

<button class="kuiButton kuiButton--basic kuiButton--iconText">
  <span class="kuiButton__icon kuiIcon fa-gear"></span>
  Settings
</button>

<hr class="guideBreak">

<button class="kuiButton kuiButton--basic">
  <span class="kuiButton__icon kuiIcon fa-gear"></span>
</button>