To indicate the caliber and manufacturer, or specific type of cartridge. For example: .22LR means 22 long rifle, which is different that a .22 short. .40 S&W means .40 Smith and Wesson, etc. which is different than a 10mm, even though a 10mm is .40 inches in diameter. .45 ACP stands for .45 Automatic Colt Pistol, which is different than .45 GAP, which stands for .45 Glock Auto Pistol.
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In English, there is a clear distinction between numbers and letters. In Hebrew, letters are also numbers.
The Romans did but these letters or numerals represented numbers.
It is algebra that represents numbers by letters which are called variables.
If the numbers and letters can be repeated then there are 45,697,600 possible outcomes. If the letters and numbers can not be repeated there are 32,292,000 possible outcomes.
Alphanumerical is consisting of letters and numbers.