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Have you tried ctrl-clicking the icon in the dock and using the Show in Finder option to find where it is? Having opened up the folder concerned (probably the Applications folder), ctrl-click the icon and use Get Info to find out more about it.
 
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Have you tried opening your Applications folder and, if you can see the icon, control-clicking it and using the Get Info menu option?

Sorry I should have explained - this is a screenshot from a video from macrumors. I recognise the app and recall reading somewhere it was useful, but have no recollection of what it was called. I’ve tried looking through the App Store too, but so far have had no luck! It’s an iOS app btw.

Thanks
 
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