WordPress at a glance
filter is not described

single_post_title filter-hook . WP 0.71

Filters the page title for a single post.

Usage

add_filter( 'single_post_title', 'filter_function_name_4202', 10, 2 );
function filter_function_name_4202( $_post_title, $_post ){
	// filter...

	return $_post_title;
}
$_post_title(string)
The single post page title.
$_post(object)
The current queried object as returned by get_queried_object().

Where the hook is called

single_post_title()
wp-includes/general-template.php 1261
$title = apply_filters( 'single_post_title', $_post->post_title, $_post );

Where the hook is used (in WP core)

wp-includes/default-filters.php 135
add_filter( $filter, 'wptexturize' );
wp-includes/default-filters.php 136
add_filter( $filter, 'strip_tags' );