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Is there a name for this data visualization?

It's almost like half a pie chart. In this case, it was animated like a speedometer you would see on a car dashboard; the divider (the needle) pointed left fully horizontal at first.

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I'd love to hear what Tufte would say about this! Data:ink ratio is rather poor. – pmgjones Aug 20 '11 at 21:06
I can't get enough of pop-charts .. more pls. – suncoolsu Aug 21 '11 at 6:15
up vote 5 down vote accepted

Here they call it a gauge charge.

Here they call it an angular gauge, speedometer or dial chart.

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