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In architecture, a decoration introduced into England in the 11th century consisting of a moulding with a zigzag outline, examples of which are to be found in Canterbury and Durham cathedrals. It is a common decoration in southern Arabia. It is also used in the cloisters of Monreale, near Palermo, in those of St Paul, outside Rome, and in many German churches. A very early example is the tomb of Agamemnon, at Mycenae.