After the transaction with your website, your customer needs a ticket number of the purchase/reservation/vote/et.al for tracking purposes. When it comes to making that a number your customer can easily write down on a piece of paper, why limit yourself to just the top row of the keyboard —why not use letters, too?
It turns out this is an easy way to cut the size of tracking codes in half. So, change the radix of your number to something higher than, base 10…
Since there are 26 letters in the alphabet, how about adding 10 + 26 = 36. The base 36 numbering system effectively uses all of the easy symbols on a keyboard which are also easy to repeat to customer service over the telephone.
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