Do you want to display your WordPress category/tag with an icon like this? That’s really easy with Advanced Custom Fields.
Add an custom image field with ACF, and set the rule to Taxonomy Term >> is equal to >> All. Save it, and this will activate image uploading options for both tags and categories. Now go to tags/categories section and upload your icon.
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Now add the code below to your archive.php template page.
<?php
$queried_object = get_queried_object();
<!-- 'icon' is the custom field name -->
$thumbnail = get_field('icon', $queried_object);
?>
<?php if( !empty($thumbnail) ): ?>
<img src="<?php echo $thumbnail; ?>" />
<?php endif; ?>
Have fun!