title: How to use emacs prettify-symbols-mode?
body: <p>I have emacs version 25.0, I enable <code>prettify-symbols-mode</code>, and type <code>(lambda () t)</code> but it doesn't prettify. How do I use this mode? Also what symbols are available and how can I configure it? Any references are appreciated.</p>
  
  <p><strong>Edit:</strong> Nothing happened in <code>scratch</code> buffer and <code>Markdown</code> mode, but when I tried in a <code>Emacs-lisp</code> mode, It did prettify, but now I got a question mark instead of the lambda symbol, how do I fix that?</p>
  
  <p><strong>Edit:</strong> I asked the related question <a href="https://unix.stackexchange.com/questions/165059/how-to-set-lang-in-locale-despite-its-in-etc-default-locale-in-ubuntu-for-uni">here</a>.</p>
  
  <p><strong>Edit:</strong> This <a href="https://stackoverflow.com/questions/17534750/emacs-not-displaying-unicode-on-reload">SO question</a> solved the unicode problem.</p>