Using alt code symbols -- small pictures made by pressing the "Alt" key on your keyboard and a number code -- on Facebook is one way to make your posts stand out. Making a check mark to post in your status update or even add to your information is a simple code you can type from almost any keyboard. The check mark made with an alt code is actually a square root symbol, making it useful for posts mathematical in nature as well.
Click inside the text box where you want to place the check mark.
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Hold down the "Alt" key on your keyboard.
Type in "251" using the number pad on your keyboard.