title: Vimscript : What is the difference between let g: , let b: , etc.?
body: <p>I often see in vim plugin something like these : </p>
  
  <pre><code>let g:variable
  let b:variable
  let l:variable
  </code></pre>
  
  <p>I made a long research on the vim documentation and on the Internet about these letters 'g', 'b', 'l', but I found noting.</p>
  
  <p>So what is these letters corresponding to ? And what is the complete list of letters ?</p>