via http://www.progressive-concepts.com/info/item.php?id=137 

The SWR meter or VSWR (voltage standing wave ratio) meter measures the standing wave ratio in a transmission line. The meter can be used to indicate the degree of mismatch between a transmission line and its load (usually a radio antenna), or evaluate the effectiveness of impedance matching efforts.

via http://en.wikipedia.org/wiki/SWR_meter

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