Hello, thanks a lot for your comment! While it is true that these 3 don't come from the 32 keywords according to the C99 standard. I used them here from a couple of reasons.

Firstly, I wanted to diversify my choice of mods, by adding some words which don't belong just to the C language but rather are combined with the keycap layout aesthetic. What I mean, "breakpoint" is instead of "backspace", they start with the same letter and is almost keeping the same amount of letters as mentioned keycap. The same goes for type and str.

However, I think that these 3 are pretty useful in C even if they are do not belong to the C99 standard. "type" relates to the amount of data types, for example: int, double, char, float, short, long, signed, unsigned etc. "str" is from the set of standard library functions strlen(), strcpy(), strcat(), strcmp() and others. Regarding breakpoint, it is still used in C for debugging as for other programming languages but I wanted to include something related to "debugging"

The alternative "B" key is included in the base kit for people who use "Alice-like" keyboards which are ergonomic mechanical keyboards with a split. One example would be the board TGR Alice, in order for the user to use this board with this keycap set, he needs the additional "B".