The Petronas Towers are the world's tallest twin towers, at 1,483 feet each. Upon their completion, they surpassed the (at the time) Sears Tower to become the tallest buildings in the world; they lost that overall title to Taipei 101 in 2004. The towers are named for Petronas, Malaysia's government-owned petroleum and gas company, which is headquartered in the towers. Architect Pelli designed the cross-section of the towers to resemble the Islamic symbol of the Rub el Hizb, while their exteriors resemble an ancient minaret, a tower attached to a mosque from which a muezzin issues a call to prayer. The towers are connected by a skybridge on their 41st and 42nd floors, allowing visitors to move between them. In the coming years, the towers will be exceeded in height by two other Kuala Lumpur skyscrapers: the slightly taller Exchange 106 and the massive, 2,185-foot PNB 118.