Old phone numbers in the U.S. had letters to denote the telephone exchange that handled any given number, a practice that lasted until the late 1970s.

In short, numerology is a system where numbers and letters have symbolic or mystical meanings. There are many different schools of numerology, such as the Pythagorean system and Chaldean method.

There are a few flight numbers you are unlikely to ever see. Flights won't ever have a number like 737 to avoid confusion with the model of aircraft. And, due solely to superstition, airlines won ...

We investigate why some numbers and letters seem more likely to win the £1m jackpot. Superstitions have grown around lucky NS&I Premium Bonds monthly draws; ...

Unlike the letters, these don't have any hard and fast meanings — they're just numbers. However, they are still controlled by rules laid out by the AFI 16-401. At least, that's the idea.