It might be hard to believe now, but there was a time that if a game took longer than a few hours or so to complete, that your progress would be saved via a password, and depending on the game, these could range from just a few letters, to pictograms, to full on extended alphabets.
Take a look at this password screen from Willow, for example
Look at that mess! Upper case and lower case letters, gigantic serifs, numbers, symbols. It's like a typewriter threw up on that screen. And if you mis-transcribe one character? Yep, your password and your hours of progress are lost. Forever.
That sucks.
The solution?
One would be to adjust your penmanship so that each character you write looks unambiguously different from the rest, but that's a whole lot of work. I like to take the slightly lazier approach.
Digital photography has progressed to the point where you'd be hard pressed to find a device that doesn't have a camera in it, so I like to grab whatever digital imaging device I have handy, snap a picture, and then use it for reference.
Of course, if I suck at photography and manage to take a blurry, unreadable picture it's just as useless as one that I wrote down poorly, so it's definitely not infallible, but it's a step in the right direction.