WordPress at a glance
filter is not described

pre_insert_term filter-hook . WP 3.0.0

Filters a term before it is sanitized and inserted into the database.

Usage

add_filter( 'pre_insert_term', 'filter_function_name_4821', 10, 2 );
function filter_function_name_4821( $term, $taxonomy ){
	// filter...

	return $term;
}
$term(string)
The term to add or update.
$taxonomy(string)
Taxonomy slug.

Where the hook is called

wp_insert_term()
wp-includes/taxonomy.php 2013
$term = apply_filters( 'pre_insert_term', $term, $taxonomy );

Where the hook is used (in WP core)

Does not used.