Recurring decimal - international question

Please help clear up a discussion with a friend.

I live in the USA, born in Scotland, our notation for a recurring
decimal was a period above the the recurring digit, ie 1/3 = .33 with a
dot above the last 3. Whereas my friend, born and bred in the US,
swears he used a vinculum or horizontal line above the last digit. A
colleague from Romania, used parenthesis, ie 0.3(3) to show recurrance.

Further investigation shows, an almost British Empire like, split
between the dot & the vinculum. Does anyone have an information on
this?

Thanks in advance,

David

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