This is really gorgeous! The shape is that of a "kamon" which means a family crest (which crest we don't know). There are no set rules in the design of a kamon. It most commonly consists of a roundel encircling a figure of plant, animal, man-made, natural or celestial objects, all abstracted to various degrees. Religious symbols, geometric shapes and kanji were commonly used as well. These symbols are often found in logos of stores (which help to identify what they sell), sushi restaurants, and on packages of food to lend an air of elegance. Senbei (Japanese crackers) and other traditional Japanese sweets may also use one.
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