What is the 'circle with a slash' icon in my notification bar?

I turned on my phone and there was a new icon in the notifications bar which is a circle with a slash through it. I can’t find out what it means or how to get rid of it. Any thoughts or can someone tell me what it is?

it’s the do not disturbed mode tap the volume button and change to all

it may have been setup in the setting/sound and notifications

My call blocker uses a similar symbol when it blocks a call.

If you slide down your notification shade (one finger slide down)

You should see the icon with additional info…which might tell you which app is creating the notification.

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