symbol declaration to use '##' as a symbol marker in you i3 config file when editing with sublime text. https://gist.github.com/budRich/7cee97217c0dff31b15e6619005f566b

i3symbols.tmPreferences

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
   <key>name</key>
   <string>Symbol List</string>
   <key>scope</key>
   <string>source.i3wm_config meta.scope.budsym.other.i3wm_config</string>
   <key>settings</key>
   <dict>
      <key>showInSymbolList</key>
      <integer>1</integer>
   </dict>
</dict>
</plist>