It's called a castle.
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The rook is sometimes called a "castle", because it looks like one, but that's not its proper name.In dutch you call it "toren" which translates as tower.
"Castle". (Castle also means a special move, notated 0-0-0 [Queenside] or 0-0[Kingside])
A castle, tower, marquess, rector, or come. However, it is almost always called the rook.