Le Guin uses the term Ekumen for her fictional alliance of worlds who derived it from the Greek Oikoumene to refer to Eurasian cultures that shared a common origin .
Her fictional alliance of worlds is a term which she got from her father .
Le Guin uses the term Ekumen for her fictional alliance of worlds , a term which she got from her father , who derived it from the Greek Oikoumene to refer to Eurasian cultures that shared a common origin .