Wikipedia
Rebiana
Rebiana is the trade name for high-purity rebaudioside A, a steviol glycoside that is 200 times as sweet as sugar. It is the primary source of sweetness in the Truvia sweetener brand. According to the Truvia website, Rebiana is derived from stevia leaves by steeping them in water and purifying the resultant extract to obtain the rebaudioside A exclusively. Cargill has filed patents which give it exclusive rights to sell Rebiana in beverages.