The Indian rupee (sign: ₹; code: INR), is the official currency of the Republic of India. The Currency Department in RBI attends to the core statutory function of note and coin issue and currency management. This involves forecasting the demand for fresh notes and coins, placing the indent with four printing presses and mints, receiving supplies against those indents and distributing them through the 18 offices of the Bank. The currency has been derived from the silver coins issued by Sultan Sher Shah Suri and later continued by the Mughal Empire.