WordPress at a glance
filter is not described

comments_number filter-hook . WP 1.5.0

Filters the comments count for display.

Usage

add_filter( 'comments_number', 'filter_function_name_5235', 10, 2 );
function filter_function_name_5235( $output, $number ){
	// filter...

	return $output;
}
$output(string)
A translatable string formatted based on whether the count is equal to 0, 1, or 1+.
$number(int)
The number of post comments.

Where the hook is called

get_comments_number_text()
wp-includes/comment-template.php 936
return apply_filters( 'comments_number', $output, $number );

Where the hook is used (in WP core)

Does not used.