TETU Max Supply is 1 Billion. This means that there will never be more than 1 Billion TETU circulating on the market.
It is the amount of TETU that has already been minted. When TETU is farmed by users or spent on development by the team, TETU becomes available on the market as part of the circulating supply.
It is the amount of TETU already circulating on the market. It is this amount that is TETU's Market Cap. A very effective way to get the approximate Circulating Supply from TETU is to subtract the amount of TETU available in FundKeeper from the amount indicated in Total Supply. The result will be the approximate Circulating Supply.