What does a1 stand for?

Answer:

Named by a King

According to the Kraft A-1 Steak Sauce web site:
In 1824, a chef to England's King George IV named Hendersen William Brand created a special sauce for the king. The monarch was so impressed with the new sauce that he proclaimed it "A1".

You can find the rest of the story at http://www.a1sauce.com/product_main.htm#history


Alternative Answer

A is the first letter of the alphabet
1 is the first whole number

So when you say somthing is A1 you are saying it is the first, the winner, the champion.

First answer by IncaBlue. Last edit by IncaBlue. Contributor trust: 1975 [recommend contributor recommended]. Question popularity: 30 [recommend question].