We're about to create a number of physical objects with codes imprinted on them. We have decided to only use uppercase letters (no numbers).
This is supposed to be read by humans in a hurry, and we want to limit the number of possible misreadings.
The examples we have right now is O-Q, VV-W and something like IN-M. In those cases we might choose to skip Q, W, M.
Are there any guides or recommendations for this?
Edit: Code Clown asked for a few clarifications.
The code will most likely be 9 letters long, but we will need to add more if we choose to remove letters other than those stated. I've suggested to group it by 3: ACF GSA TRE
The code is not to be memorized; the persons reading it will see it for the first time, then either read it loud to an operator or type it on a mobile device.
The operator and website can give instructions about the code length, give suggestions for disallowed letters and/or autocorrect Q-0-O. If we decide to add such scheme, it will be added after an evalution round.