The ASCII character code 0x07 is an audio signal.
Opening CMD and pressing ALT+ 007gives:

And when I click ENTER, I hear a beep. This is normal.
I was looking for how to add a beep at the end of a batch file, and I found that this solution: (I insert it as an image because SO does not show the round mark after editing):

It works and makes sound. When viewed using the HEX viewer (without comparison) on ECHO, round bullet:

But if I manually add ALT+ 7to the document, I see the following:

95 - . , ALT + 7:

HEX:

:
. Alt+65 A.
, Windows?
, ALT+007, ^G ( ), ALT+7, , :
:

++:

, .., .