• Chatter (machining) or machining vibrations
• Contact bounce or chatter, a common problem with mechanical switches and relays
• Chatter (terrorist)
  Chatter (terrorist)
  Chatter is an old term from signal intelligence, used more generally after the turn of the 21st century in the United States "war on terror". Intelligence officials, not having better metrics, monitor the volume of communication, to or from suspected terrorists, to determine whether there is cause...
  
  , the volume of communication to or from suspected terrorists
• Project CHATTER
  Project CHATTER
  Project CHATTER was a United States Navy program beginning in the fall of 1947 focusing on the identification and testing of drugs in interrogations and the recruitment of agents. Their search included laboratory experiments on both animal and human subjects...
  
   (1947–53), a U.S. Navy truth serum project
• Chatter, a group communication tool from Salesforce.com

See also

• Chattering classes
  Chattering classes
  The chattering classes is a generally derogatory term first coined by Auberon Waugh often used by pundits and political commentators to refer to a politically active, socially concerned and highly educated section of the "metropolitan middle class," especially those with political, media, and...
  
  , a politically active, socially concerned and highly educated section of the "metropolitan middle class"
• Chatter mark
  Chatter mark
  A Chatter mark is one or, more commonly, a series of marks made by vibratory chipping of a bedrock surface by rock fragments carried in the base of a glacier...
  
  , an indication of glacial erosion
• Chatter Telephone
  Chatter Telephone
  The Chatter Telephone is a pull toy for young children ages two to six. Introduced in 1962 by the Fisher-Price company as the "Talk Back Phone" for infants and children, the Chatter Telephone is a roll along pull toy. It has a smiling face, and when the toy is pulled, it makes a chattering sound...
  
  , a classic roll along pull toy with a friendly face and eyes that move up and down when the toy is pulled.