It’s a taxonomy loop. This is the code I currently have on the site, orderby=random is sorting them alphabetically.
<Loop type=taxonomy_term taxonomy=project_type post=current count=3 orderby=random>
<div class="related">
<a href="{Field url}">
<div class="fl-post-image"><Field acf_image=cat_image size="small_list" /></div>
<h3 class="white"><Field title /> Projects</h3>
</a>
</div>
</Loop>