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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.
The troy pound is 5 760 grains (≈ 373.24 g, 12 oz t), while an avoirdupois pound is approximately 21.53% heavier at 7 000 grains (≈ 453.59 g).