Terminal control/Ringing the terminal bell
Make the terminal running the program ring its “bell”. That is often done on modern systems by playing some other sound which might or might not be configurable, but was classically a physical bell within the terminal. It is usually used to indicate a problem where a wrong character has been typed.
You are encouraged to solve this task according to the task description, using any language you may know.
Tcl
<lang tcl>puts -nonewline "\a";flush stdout</lang>