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Gigagram or gigagramme is equal to 109 gram (unit of mass), comes from a combination of the metric prefix giga (G) with the gram (g). Plural name is gigagrams.
A pennyweight (abbreviated dwt or denarius weight) is a unit of mass that is equal to 24 grains, 1⁄20 of a troy ounce, 1⁄240 of a troy pound, approximately 0.054857 avoirdupois ounce and exactly 1.55517384 grams.