What does a key symbol at the right top of my screen mean?

[AC Question]

Why is there a key symbol on my screen and what does it mean?

 

[Tim1954]

Usually means VPN. A screenshot would be helpful

 

[Tim1954]

The key in top left corner is Adguard (vpn)...

 

[flamerunner07]

It means you're are connected or disconnected from a vpn connection.
Of you remove the connection from your phone (active or inactive doesn't matter) it will disappear again.

 

[Dennis Mccormick]

what does this key symbol mean in the right top corner of my screen mean

 

[Laura Knotek]

what does this key symbol mean in the right top corner of my screen mean

Would you please post a screenshot showing what you see. That will help us to help you.