Why is Jack Daniels called number 7?

Related questions

1. Where is Jack Daniels Rye made?
2. Is Jack Daniels bourbon or rye?
3. What does Crown XO stand for?
4. Is Jack Daniels single malt or blended?
5. Is Jack Daniels in a dry county?
6. Why is Jack Daniels called Old No 7?
7. Which is sweeter bourbon or rye?
8. What's the difference between an old fashioned and a Manhattan?
9. How much do Jack Daniels employees make?
10. Is Jack Daniels a rye whiskey?

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