Svarloka (in Buddhism: Arupadhatu), the best and holiest realm, reserved to the gods. Often called svargaloka. The internal courtyard as well as the roof of each temple symbolize the realm of svarloka. The roof of Prambanan temples are adorned and crowned with ratna (sanskrit: jewel), the shape of Prambanan Ratna https://hanumanhindutemples.blogspot.com/