What does the up and down arrow with a slash mark through it mean?

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Android Central Question

What does the up and down arrow with a slash mark through it in the upper left corner of my home screen mean? I tried to add a screenshot but I couldn't get it to work. The arrows are next to one another...the one on the left points down and the one on the right points up, and there is one slash mark through both arrows going from top left to right bottom.