swan's neck pediment

or swan neck pediment

noun Architecture, Furniture.

a broken pediment, the outline of which consists of a pair of S-curves tangent to the cornice level at the ends of the pediment, rising to a pair of scrolls on either side of the center, where a finial often rises between the scrolls.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019