Have you ever looked really closely at the sign on your local 7-Eleven store? If you haven't, I've provided a picture of one in my town for your convenience. (It is, after all, a convenience store.) All of the letters in the word eleven are upper case, except for the last one. For some reason, the final "N" is lower case.
Now that you've seen it, you'll never be able to UNsee it. You're welcome.