An intricate style of traceried vaulting, common in late English Gothic, in which ribs arch out like a fan.
一种复杂的拱顶建筑风格，流行于英国哥特式末期，其拱棱发散似扇形。
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Especially an elongated boss (carved keystone) at the junction of the intersecting ribs of the fanvaulting associated with the English Perpendicular style.