If your Mac starts up to a circle with a line through it - Apple Support

A circle with a line through it means that your startup disk contains a Mac operating system, but it's not a macOS that your Mac can use. 

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Get started with your Mac - Apple Support

If your Mac starts up to a circle with a line through it

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How to Fix Mac Boot to a Circle with a Line Through it?

Startup issue. PLEASE HELP - Apple Community

If your Mac asks you to allow an accessory to connect - Apple Support

Intro to syncing your Mac and your devices - Apple Support

MacBook Pro m1 random exclamation mark with circle : r/macbook

Sign in or out of your Apple ID on Mac - Apple Support

What to do with the “your screen is being observed” error

Different Types of Lines in Math

here's a line… illuminated dandelion

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Add A Line - Add a Person or Device to Your Account - T-Mobile

Straight Line Images – Browse 450,264 Stock Photos, Vectors, and Video