scallop
noun
any of the bivalve mollusks of the genus Argopecten (Pecten ) and related genera that swim by rapidly clapping the fluted shell valves together.
Used to describe actions that started in the past and continue into or have direct relevance to the present.
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Figure 229 Letters signifying the New England Guards are embossed on a shield of white metal that is attached to this brass plate, which has scalloped corners.
From American Military Insignia 1800-1851 by J. Duncan Campbell