You'll need some sort of equation editor for this kind of thing. Most office suites include an equation editor.
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The symbol separating the dividend from the divisor in a long division that is drawn as a right parenthesis (or sometimes a straight vertical bar) with an attached vinculum extending to the right seems to have no established name of its own. It can therefore simply be termed the "long division symbol," or sometimes the division bracket.
Division by zero is not allowed, an undefined operation. I've never seen a calculator display the infinity symbol, but it's probably better for the calculator to do that rather than display the message "You're not supposed to do that, dummy!"
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The long division symbol has no established name of its own. However, it consists of a closing bracket and a horizontal line on top of the numbers called a "vinculum" - from the Latin meaning "something which is tied up".