noun. 1  A water basin fixed to a wall or floor and having a drainpipe and generally a piped supply of water. 2  A cesspool. 3  A sinkhole. 4  A natural or artificial means of absorbing or removing a substance or a form of energy from a system. 5  A place regarded as wicked and corrupt: That city is a sink of corruption.
Visa - Digits two through six are the bank number, digits seven through 12 or seven through 15 are the account number and digit 13 or 16 is a check digit. MasterCard - Digits two and three, two through four, two through five or two through six are the bank number (depending on whether digit two is a 1, 2, 3 or other).
My wife and I are wondering what number to use for the Non Immigrant Visa Number on Part 3(a) of the I485 form. Usually people will use the 8 digit red number on their passport. for their current visa.