A "scallop pattern" refers to a design or shape that resembles the curved edges of a scallop shell, with small, rounded protrusions alternating with concave curves. Full definition
Using the white icing gel tube, pipe an inside - out scalloped pattern around the top edge of each OREO, like you see in the photo below. (comicconfamily.com)
Aqua Mermaid features a beautiful scallop pattern in a soft blue pallet. (thevintagehoneyshop.com)
Coral Mermaid features a beautiful scallop pattern in a soft coral pallet. (thevintagehoneyshop.com)