Weird concentric circles logo on iPad that can't be removed

Soldato
Joined
7 Mar 2005
Posts
19,483
Location
LU7
On one of our 20 school iPads, I recently noticed the logo bottom left of the image below. I tried to remove it but as you can see the other three apps have the cross to let me delete the app. The logo doesn't and it isn't selectable. Any ideas what has happened and how I can fix it?

ipad_weird_logo.jpg
 
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