WordPress at a glance
function is not described

get_post_format_string() WP 3.1.0

Returns a pretty, translated version of a post format slug

No Hooks.

Return

String. The translated post format name.

Usage

get_post_format_string( $slug );
$slug(string) (required)
A post format slug.

Code of get post format string: wp-includes/post-formats.php VER 5.0.3

<?php
function get_post_format_string( $slug ) {
	$strings = get_post_format_strings();
	if ( !$slug )
		return $strings['standard'];
	else
		return ( isset( $strings[$slug] ) ) ? $strings[$slug] : '';
}