Do you remember what app used to be there? This is the sort of thing that can happen if an app is removed but not cleanly uninstalled, e.g. if you move it to SD then change SD cards (though I'd still expect the launcher to let you remove it).
That's odd indeed.
Have you checked your installed app list to see if anything is there that doesn't look familiar?
Does it remain there after a reboot?
Yes, it is a generic android icon. When someone has developed an app with Android Studio, this is default icon for his/her app.
Settings - Apps, check your app list to find that strange app.
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