get term thumbnail
snippet in php

get term thumbnail

user1525

$image_id           = get_term_meta( $term->term_id, 'thumbnail_id', true );
$post_thumbnail_img = wp_get_attachment_image_src( $image_id, 'large' );

echo '<img src="' . $post_thumbnail_img[0] . '" alt="' . $term->name . '" />';