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copied!<p>Frankly, I think the most important factor here is choosing the correct font.</p> <p>If your goal is purely legibility, it will be a matter of picking a font that's preferably:</p> <p>1) Fixed width. For picking out random numbers/letters, fixed width helps tremendously, since the kerning isn't changing as you move across the font.</p> <p>2) Use a font with separate 0/O looks - those definitely mess people up. Look for other letter/number combinations that are similar. Potentially, leave 0/O out of the mix just for this reason.</p> <p>3) Choose a font with subtle serifs and weight changes.</p> <p>For some guidelines on legibility, see <a href="http://www.fonts.com/aboutfonts/articles/typography/legibility.htm" rel="noreferrer">this page</a>.</p> <p>With the right font, I think you could pick any letter/number combination and have it be understandable clearly (other than potentially 0 and O). I believe the 8/B, 5/S and other samples would be clear in the correct font.</p> <p>The other thing you could consider would be to use one color for letters and a second for numbers - this would give clues to the potentially ambigous number/letter combinations. I'd make this a subtle cue, though, as having a drastic color change will draw attention to letters or numbers, which will hurt the overall readability.</p> <hr> <p>Edit after reading your comment to another answer:</p> <blockquote> <p>I only need a few thousand codes, so I'm not terribly worried about the size of the domain</p> </blockquote> <p>If this is the case, I would recommend leaving the entire number set, and just selectively adding in letters that have no visual (or aural, if you're reading these) similarity to numbers. With 6 digits, even with numbers, you have more code possibilities than you need. Selectively adding in letters to help differentiate will be easier than trying to selectively remove some. I would probably stick to 1-9, A, Z, R, W, and other letters that don't match up with numbers.</p>

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