Richard Adair says it is called a repetend bar.
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Oh, dude, a perfect repetend is just a fancy way of saying a repeating decimal that goes on forever without any other non-repeating digits sneaking in. It's like when you're stuck in a loop of the same numbers over and over again in math class, except this time it's actually a good thing. So, like, if you see 0.333... or 0.666..., you've got yourself a perfect repetend.
A bar.
It is spelled "repetend", and it's the part of a repeating decimal that is repeated, as 1234 in 0.123412341234. (from dictionary.com)
It is usually called the division bar or the fraction bar
It's called the vinculum, but it can also be called the fraction bar or division bar.