Have you ever thought about the meaning of those 16-digits on your
shiny credit card? Nope, not a random number generator, folks.
In fact, the first two digits
of your card identify the type of industry that issued it. For example,
a 1 or 2 means you snagged some plastic from your favorite airliner,
while lucky number 4 or 5 indicates a banking institution.
(BroBible.com)
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