STAA put in a huge Doji on its daily chart today. Technically, a doji is a candlestick where the open and the close are the same. The huge upper shadow and relatively small lower candle makes STAA's Doji especially striking. It is very close to being a "Gravestone Doji" - a doji with a big upper shadow and no lower shadow.
Doji's often signal a reversal. We can see the reason for that by looking at the 10-min intraday chart for STAA:
As we can see on the intraday chart, the quick move up followed by a lack of follow thru had two consequences - 1.) it probably depressed the STAA bulls and 2.) it created the big doji on the daily chart. Which is why dojis often indicate reversals.