White Candlestick
  
The code name of someone’s spy contact in a John le Carre novel. Or maybe a mischievous minor character in Alice in Wonderland.
It's also a term in technical trading.
A candlestick chart is a kind of graphic representation of a security’s trading during a period of time. It consists of a small rectangle, oriented with the long sides vertical, combined with a vertical line situated behind the rectangle, usually with a little bit of the line peeking out the top and bottom.
The rectangle represents the distance traveled from the opening price to the closing price. Meanwhile, the vertical line shows the distance from the high point of the time period to the low point. (A candlestick often covers a day’s trading, but it can represent any time period.)
Put together, each time period looks like a candle body (the rectangle) and a wick (the vertical line)...although, different than most candles, the wick, in this case, can poke out the bottom as well.
The color of the candlestick indicates whether the price moved higher or lower. White or green means a time period when the close was higher. Red or black represents a lower close. So a white candlestick is a candlestick chart representation of a time period when the price for the security rose for the period. Its opposite would be a black candlestick, one where the security closed lower for the time period.