It's called a "bang" or an "exclamation point" and it's used in lots of different ways. Webster defines it as being used to close questions that are meant to convey extreme emotion, as in "What a great show! Oh my god!"
Geeks, on the other hand, use bangs as delimiters. In the old days, email addresses sometimes used bangs to separate words, like "email@example.com" but now, you're more likely to see underscores as delimiters.
They also use it in various flavors of Linux/UNIX to run a program. For example:
! ls -1 /docs/invoice*
Type this, and your machine runs the Unix ls command to list all file names beginning with "invoice" in the /docs directory.
Finally, the yellow bang you see in the Windows Device Manager means that your device is not being recognized properly, and needs either a driver update or removal and reinstallation.
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Up To The Minute Bargains
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You can always call in to the show at the number listed above, or send David an email using the link above.
To repeat: You can always call in to the show at the number listed above, or send David email using the link above.