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Traditional Chinese hat of the Manchurian people.
It's semicircular in shape, reminiscent of a kepi or cabbie hat, with its visor. However, some versions do not have a visor. Its literal translation is hat ring.
It's often a made up of a metal frame, adorned with materials like silk or rattan. Common patterns on the dianzi includes dragons, phoenixes, butterflies, bats, flowers and clouds.
It was often worn over liangbatou, to protect the hairstyle. It is hat, so tiara shaped hair ornaments/hairbands may be better described as dalachi or fengguan.
Examples
Dianzi with lappets (hat flaps).