Display posts from specific slug of the custom taxonomy in WordPress

I would recommend becoming intimately familiar with the WP_Query parameters:
https://developer.wordpress.org/reference/classes/wp_query/

In your particular case; dealing with taxonomies:
https://developer.wordpress.org/reference/classes/wp_query/#taxonomy-parameters

Here is the proper code to pull from a taxonomy:

$args = array(
    'post_type' => 'post',
    'tax_query' => array(
        array(
            'taxonomy' => 'units',
            'field'    => 'slug',
            'terms'    => $term->slug
        ),
    ),
);
$query = new WP_Query( $args );

The taxonomy should be the slug of your registered taxonomy. In this case, I’m assuming units.