Double-Smoothed

Double-Smoothed
A price series that has been smoothed by a mathematical technique such as a moving average. This first series of smoothed price data is then smoothed a second time.

Double-Smoothed
A price series that has been smoothed first by a mathematical algorithm such as an exponential moving average and then the output of the first smoothing is then smoothed a second time by a similar method.
Double Top ...

of a security or market average where it has declined (advanced) two times to the same approximate level, indicating the existence of a support (resistance) level and a possibility that the downward (upward) trend has ended. Double-Smoothed: A ...

The implication is that by failing to break below the first price low, Double-Smoothed: A price series that has been smoothed by a mathematical technique such as a moving average.

Raw K - Check this box to have the Double-Smoothed Stochastics line (Slow D) drawn.
Raw K Period - Period used for the raw stochastics calculation. This period is used to establish the range.

They are actually double-smoothed simple moving averages. The periods used in the simple moving averages varies depending on if you specify an odd or even number of time periods.

Triangular moving averages place the majority of the weight on the middle portion of the price series. They are actually double-smoothed simple moving averages.

See also: Moving average, Period, Indicator, Average, Trading