Tajikistan | 20 Somonī, 2000 | Obverse: Portrait of Abūalī ibni Sino (or Avicenna) (980-1037), was a Persian polymath who is regarded as one of the most significant physicians, astronomers, thinkers and writers of the Islamic Golden Age. He has also been described as the father of early modern medicine | Reverse: Hissar Castle (or Hisor Castle) and artifacts, and National flag of Tajikistan | Watermark: Abūalī ibni Sino |