public function getSymbols(): iterable
    {
        return new \CallbackFilterIterator(
            new \RecursiveIteratorIterator(
                new \RecursiveArrayIterator($this->symbols, \RecursiveArrayIterator::CHILD_ARRAYS_ONLY)
            ),
            function ($each): bool {
                return $each !== false;
            }
        );
    }
public function getSymbols(): iterable
    {
        return new \CallbackFilterIterator(
            new \RecursiveIteratorIterator(
                new \RecursiveArrayIterator($this->symbols, \RecursiveArrayIterator::CHILD_ARRAYS_ONLY)
            ),
            function ($each): bool {
                return $each !== false;
            }
        );
    }
public function getSymbols ( ) : iterable { return new \ CallbackFilterIterator ( new \ RecursiveIteratorIterator ( new \ RecursiveArrayIterator ( $ this -> symbols , \ RecursiveArrayIterator :: CHILD_ARRAYS_ONLY ) ) , function ( $ each ) : bool { return $ each !== false ; } ) ; }
Get the symbols that are present in the tracker.

@return iterable|Name[][]
Get the symbols that are present in the tracker .