User Control Panel; usually found on internet forums.
The User CP allows each user to customize their preferences, change their avatar, read messages, subscribe to threads, view their bans and infractions, join usergroups, and so on
Since I went on holiday, my UserCP is full of unread messages
Question Answered, Thread Locked; abbreviation used by Moderators to clean up Question and Answer threads to prevent spam and improve ease of access for member browsing