Google Plus Hidden Smileys
There are some undocumented smileys in Google Plus which are not visible in any of the options. In the below image we have different sections like Emoticons, Shortcut Key & Description. The Emoticons section shows the preview of the smiley codes(Shortcut Key) and the Shortcut Key section shows the code of the smileys and the Description sections shows the name of the smiley.
To use this, just copy the Shortcut key code and paste it in the Google Plus Chat and send across.