What is this exclamation mark on top of a underscore in my notification window?

[AC Question]

exclamation mark on top of a underscore in my notification window

Samsung s5 trying to figure out what the symbol us

 

[B. Diddy]

Re: exclamation mark on top of a underscore in my notification window

Welcome to Android Central! Is it on the left or the right side of the status bar? When you swipe down the notification panel, do you see any more details?