Imperial unit of mass. The commonly used avoirdupois pound, also called the imperial standard pound (7,000 grains/0.45 kg), differs from the pound troy (5,760 grains/0.37 kg), which is used for weighing precious metals. It derives from the Roman libra, which weighed 0.327 kg.
Green, yellow, and red are the pan-African colours. The flag is modelled on the French tricolour. The design was identical to the Rwandan tricolour, obliging that country to modify its flag. Effective date: 1 March 1961.