How can I find out which taxonomy a label belongs to?

Question

WordPress

I implement product filters, not Woocommerce.

Answer 1

An object of type WP_Term contains the name of the taxonomy in the $term->taxonomy property.
Get_term( $term_id ) is used to get the term object.

$term = get_term( $term_id );
echo $term->taxonomy;

If you are on the archive page for a given term, you can get the term object with get_queried_object().