Svarloka (in Buddhism: Arupadhatu), the best and holiest realm, reserved with the gods. Often known as svargaloka. The internal courtyard as well as 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://indiantemplesnearme.blogspot.com/