title: How to map mac command key in vim?
body: <p>I want to map my NERDTREE toggle to <strong>Cmd + space</strong> but I don't know what character represents Mac's command key in .vimrc. I searched and found that we can use 'D' to represent cmd key from <a href="https://stackoverflow.com/questions/28528151/how-to-map-command-key-when-configurate-vimrc">this</a> link, but it doesn't work.
  BTW I am using vim from the terminal not MacVim.</p>