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On most chat platforms when a person joins the channel/room/whatever a notice will be sent to all users indicating the user entered the chat. It comes from old IRC servers.
High-frequency trading has entered the chat.
What chat?
On most chat platforms when a person joins the channel/room/whatever a notice will be sent to all users indicating the user entered the chat. It comes from old IRC servers.
https://www.urbandictionary.com/define.php?term=Has entered the chat