Devices like iPhones have a unique name, a string that is usually called a "universally unique identifier." That the word "unique" doesn't ever need any modifier is, I guess, beside the point. It's not just unique, it's unique in the whooooole universe. Sometimes they call it a globally unique identifier. Heh. Anyway, a UUID is 32 characters and four hyphens. There are, according to the math whizzes on Wikipedia, 39 digits in the number representing 32 possible combinations of letters and numbers. That's a really big number, more than there are people, for sure.
This is a helpful thing, for obvious reasons. Wouldn't it be amazing if every human had [...]