the main structure is directly connected to the arcades that are spread around the large courtyard. the arcades connect the main building with a single minaret in the southern corner. unlike many arabic, persian, turkish and indian mosques with multiple minarets, istiqlal mosque has a single minaret to symbolize the divine oneness of god. it is 66.66 m tall to symbolize (incorrectly) the 6,666 verses in the quran. the 30-metre-high stainless steel pinnacle on top of the minaret symbolizes the 30 juz' of the quran. on the southern side near the minaret there is also a large "bedug" (large wooden drum made of cow skin). in common with the entire islamic world, traditionally muslims in indonesia use the drum with the adhan (call to prayer). the mosque offices, function hall, and madrasah are on the ground floor. the mosque provides facilities for social and cultural activities.