The first six digits, including the major industry identifier, compose the issuer identifier number (IIN) which identifies the issuing organization. The IINS was previously called the "bank identification number" (BIN) and some places still use that term.
Read more about this topic: ISO/IEC 7812
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“I wonder love can have already set
In dreams, when we’ve not met
More times than I can number on one hand.”
—Philip Larkin (1922–1986)