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).
For Non-Immigrant Visa, Visa number is the RED Number on the Visa itself. This answer is from USCIS. It is the RED number - check out this CIS Form that advises under Visa # (not the control number that begins with a year) Please refer to the related link for more information. 1  If you mean a non-immigrant visa such as a B1, B2, F1, H1B, then it's on the visa itself. The visa would be the nice-looking laminated sticker (the new ones, at least) on your passport, and the number would be a long number on the top of the visa.