I don't know which tablet you have. You might try long pressing your screen and see if a menu appears so you might reselect your app icon. Welcome to Android Forums.
Here is a link to the list of tablets and their support areas here at AF. Just open the list and then give your tablet name a click to enter your tablet's area of support. It's there that you will be able to get first hand information from the other users of your tab. They can easily guide you on your app icon recovery. Have fun.
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