It is a 6-digit number assigned by Visa to each acquirer. If a merchant has different acquirers for Authorization versus Settlement, the merchant will have a separate BIN for each one. SIGIS is only collecting the Authorization Acquirer BIN at this time.
Carbon forms a vast number of compounds, more than any other element, with almost ten million compounds described to date, and yet that number is but a fraction of the number of theoretically possible compounds under standard conditions. For this reason, carbon has often been referred to as the king of the elements.
There is also a stable isotope of carbon, 13 C. This isotope is important in that it allows us to correct for carbon isotope fractionation in nature and during analytical procedures. Abundance of carbon isotopes in nature 12 c