It is value of cryptocurrencies ether, used on Ethereum block chain to buy and sell goods and services. Gwei is commonly used unit of ether because it can specify gas price more specifically. Gwei is also called Nano or nonether which signify the 9th power of paltry ETH. If you attempt to see the somatic size of Gwei, it is expected that you will not succeeded, because measurement in ether is fundamentally unnoticeable, like numerical dust. As with other cryptocurrencies, Gwei is only used for writing codes and for technical cases.