The great majority of Sri Lankan corporations have their head offices in Colombo including Aitken Spence, Ceylinco Corporation, Stassen group of companies, John Keells Holdings, Cargills, Hemas Holdings, and Akbar Brothers. Some of the industries include chemicals, textiles, glass, cement, leather goods, furniture, and jewellery. In the city centre is the World Trade Centre. The 40-story Twin Tower complex is the centre of important commercial establishments, in the Fort district, the city's nerve centre. Right outside the Fort area is Pettah which is derived from the Sinhala word "pita" which means 'out' or 'outside'.