What A Credit Card’s First Digit Means

From The Consumerist:

You can tell a lot about a person by looking at their shoes, and likewise, by looking at their credit card’s first digit. This represents the Major Industry Identifier. Here’s the breakdown.

1,2: Airlines
3: Travel/Entertainment
4,5: Banking/Financial
6: Merchandising/Financial
7: Petroleum
8: Telecommunications
0,9: Other