In the central courtyard are six large hydraulically operated umbrellas, inspired by the ones at Al-Masjid al-Nabawi in Medina, which are used to protect worshipers; the six umbrellas represent the six tenets of iman. More than 15,000 worshipers can fit in the prayer area. At the open end of the U is a series of Arabic-style arches, with Arabic calligraphs of 99 attributes of Allah, stood on 25 pillars, each representing one of the named prophets in Islam. Beyond the arches is an inscription on a tall, 7.8 ton stone from Mount Merapi, designed by Nyoman M. Alim.