A candle that is all body and virtually no wick — it opened at one extreme, closed at the other, and never looked back. One side controlled the session from bell to bell.
The open sits at or very near the low and the close at or very near the high, or the reverse for a down day. The absence of wicks is the point: at no stage did the other side push price back.
It is a continuation signal more than a reversal one. A bullish marubozu in an advance says demand is still unmet; a bearish one in a decline says the same of supply.
The name means bald or shaven-headed in Japanese, describing precisely the missing wicks. Where it appears matters most — one that breaks a stock out of a long range is far more meaningful than one deep inside an established trend.
A marubozu on the third or fourth day of a strong run frequently marks a short-term climax rather than continuation, since the buyers most willing to chase have now acted.
Circuit-limited moves in smaller stocks produce a wickless body artificially — price simply could not trade beyond the band. That is a market-structure artefact, not conviction.
It says nothing about how much further a move can extend. Traders generally use it as evidence a trend is intact rather than as an entry in itself.