Wiggle room
The dollar or percentage allowance for a trade to work before a stop loss is triggered.
Weighted average
A moving average that uses a selected time span, but gives greater weight to the more recent price data.
Wash
A selloff with high volume.
Whipsaw
Price action that is volatile, moves rapidly up and down.
Wedge
A triangle formation where price is bouncing inside converging trend lines.
Williams %R
A momentum indicator much like the Stochastic Oscillator and is especially popular for measuring overbought and oversold levels.