article at macd stockcharts.com
Volatility measure. It is the average daily movement. When placing stops this is something to consider. e.g. set your stop 2xATR away from the entry point.
under development :)
Parity - equal prices. e.g. if the AUD reaches parity with the USD, then 1 AUD = 1 USD.
loonie - CAD, Candian dollar