Tsewang Dorjee Q. Tim la ,I am sorry to ask you question. What exactly vigesimal system mean?

Ans.Tim Bodt
Lopen Tsewang, vigesimal system of counting means a system of counting in which 20 is the basic unit of calculation as opposed to the normal decimal system based on 10. French, Danish and other European languages have it, and some Tibeto-Burman languages have, or had it, including Tshangla. Even English use to have it (one score = 20, two score = 40 etc.). Instead of counting the number of fingers on two hands (2*5 =10), the number of joints between the metacarpal and proximal, proximal and intermediate, intermediate and distal, tip of the finger and distal and intermediate phalanx (small bones) on the four fingers (so excluding thumb) are counted (4*5 = 20). Tshangla calls 20 khaithur and 400 (20*20) and nyisho, Khengkha calls 20 khaithek and 400 nyisho, Dakpa calls 20 khaithi and 400 phongthi, Dzongkha calls 20 kheci and 400 nyisho etc.