Doji
A candle where open and close are nearly equal - tiny body, possibly long wicks.
A doji after a strong trend signals indecision. After an extended move, it can mark exhaustion. Context (where in the session, where relative to levels) is everything - trading every doji blind is a losing game.
Related
Learn to actually use Doji.
Definitions are the easy part. The free first five modules put this on a real chart and make you do the work. No card required.