VIM : What is the difference between let g: , let b: , etc

Question

I often see in vim plugin something like these :

let g:variable let b:variable let l:variable 

I made a long research on the vim documentation and on the Internet about these letters 'g', 'b', 'l', but I found noting.

So what is these letters corresponding to ? And what is the complete list of letters ?

Answer 1

See :help internal-variables

It lists the following types:

                 (nothing) In a function: local to a function; otherwise: global  buffer-variable    b:     Local to the current buffer.                           window-variable    w:     Local to the current window.                           tabpage-variable   t:     Local to the current tab page.                         global-variable    g:     Global.                                                local-variable     l:     Local to a function.                                   script-variable    s:     Local to a :source'ed Vim script.                      function-argument  a:     Function argument (only inside a function).            vim-variable       v:     Global, predefined by Vim.