Why do C and C++ programmers prefix variables with "g" and "k"?

Question

I have noticed this recently in C and C++ libraries. It seems common to use gFoo and kBar as forms of variable names. I assume "g" means global, but does "k" mean constant? I noticed that Atom and Visual Studio Code both highlight these forms with a different color, which would be convenient if I could understand their meaning. Are there any more conventions for naming the scope of variables, rather than their type as with Hungarian notation?

Edit: I found others, but I have not yet found the grammar file in Atom which describes these variable names.

Answer 1

g and m are scope prefixes, global and member. k is used for constant because c was used for char. The other 2 prefixes in your example are f for float and s for static.

More important than the internet's opinion on variable naming conventions is your boss's opinion on them, if they say k stands for constant in German, that is what it stands for :D