portcullis

laskuportti A gate in the form of a grating which is lowered into place at the entrance to a castle, fort, etc.
puhekieltä A heraldic representation of such a gate used as a charge, often with chains attached; as in the arms of the City of Westminster.
puhekieltä An English coin of the reign of (w), struck for the use of the (w), and bearing the figure of a portcullis on the reverse.
To obstruct with, or as with, a portcullis; to shut; to bar.

(rfquotek)