"idle character." YourDictionary, n.d. Web. 08 June 2018. <http://www.yourdictionary.com/idle-character>.
idle character. (n.d.). Retrieved June 08th, 2018, from http://www.yourdictionary.com/idle-character
In data communications, a character transmitted to keep the line synchronized when there is no data being sent. See idle interrupt and System Idle Process.