What is use of \a in c++

Answer 1

https://stackoverflow.com/questions/3456138/this-program-sounds-the-bell

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Answer 2

It adds a space, apparently. So,
cout<<"Hi\a\n\aHi";
would output
Hi
Hi
cout<<"Hi\aHi";
would output
Hi Hi

<<This is all based on me just messing around in the SL playground, so it may act differently here than elsewhere.>>