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The first field is the Soundex code (a letter and three numbers) for the driver's last name. This roughly describes how a given word sounds, with the first letter being the first letter in the name and the remaining numbers (from 1 to 6) indicating different categories of sounds created by consonants following the first letter.
Why have a Soundex code when a larger variety of such could be encoded by just having the next 3 consonant letters. It isn't because they want a numbers only code since the first one is a letter.
I guess the reverse is the What3words geo location app. The entire earth's surface has been divided into 10x10 ft squares (3x3 meters), and any of those positions can be determined with only 3 simple words. I had hoped it would become very popular. Once you have it on your phone it can be very handy for finding someone with relatively good precision.
https://what3words.com/clip.apples.leap