What is lsh_ used for and/or what is it doing?

I am new to programming in Linux and I am quite confused. I notice the lsh_ prefix is used for function names [here](https://brennan.io/2015/01/16/write-a-shell-in-c/) . I'm not sure why. The only thing I can find on the internet is that lsh could possibly mean "limited shell". However, it is not clear. If that is what it means, what is a "limited shell" and how or why are we using it? example: lsh_loop()