What is the name of the half-circle atop a portal that depicts a religious scene in Romanesque architecture?

Name: What is the name of the half-circle atop a portal that depicts a religious scene in Romanesque architecture?
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Question

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The tympanum is the semi-circular or triangular decorative wall surface over an entrance, bounded by a lintel and arch. It often contains sculpture or other imagery of a religious nature in Romanesque architecture.

What Is the Name of the Half-Circle Atop a Portal