“Hi hi” would be interpreted as saying hello 2x in quick succession when you are excited to see someone.
We also sometimes use “kk” to mean, “okay, got it.” But emphasized or excited.
When I was growing up, my family used my mom's college typewriter, which did not have numeral 1 or 0 keys. Instead, you typed a lowercase L and an uppercase O. It was one of the typing habits, and you didn't even think about it.
When she took a computer programming class, around 1979, the terminals had all of the numerals, and of course she was constantly mixing them up, causing errors. A year later she became the teacher of that class, and completed the requirements for a CS major by staying a semester ahead of her students for a few years. She always reminded her students: "Computers are stupid. They will do exactly what you tell them."
The typewriter that I got for college had all of the numbers. Of course I used it for about a year before ditching it for a word processor. But everybody kept an old typewriter around for many years after that, because you might need one for filling out a form.
If we forbid 0, we get "bilges" and "sleigh". Both of which strike me as great opportunities for an extremely obscure Easter egg in an adventure game ...
Also, for completeness: 0O, 1I, 2Z, 3E, 4H, 5S, 6G, 7L, 8B.
So you can `grep -ix '[iozehsglb]*' /usr/share/dict/words` yourself.
hillbillies never would have fit
Adjective boobless
1. (slang) Without boobs (breasts). https://en.wiktionary.org/wiki/boobless
Which also includes an audio pronunciation, which should be invaluable to all teenage boys.
[0] https://en.wikipedia.org/wiki/Georg_Wilhelm_Friedrich_Hegel
If we look at the translation table we see that most of them can be interpreted as both major and minor caps, while only 4h is locked to lower caps, and 3E, 7L, and 8B is locked to upper.
I guess 6g kind of brings a balance, but I would prefer 'it's all caps, except 4 which we try to ignore'.
0O: both caps
1I: both caps
2Z: both caps
3E: upper
4h: lower
5S: both caps
6g: lower
7L: upper
8B: upper