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Prior to the discovery and naming of actinium, the abbreviation Ac (or AC) was sometimes used in chemical formulas to indicate the acetate ion. For example, the formula for sodium acetate might be given as NaAc, rather than the more modern CH3COONa or NaC2H3O2. In the field of organic chemistry the abbreviation Ac refers to the acetyl group, therefore in the organic chemistry literature acetate is referred to as −OAc, sodium acetate as NaOAc, and ethyl acetate as EtOAc.
The compound is used in casino-standard dice, because it is much harder to tamper with than wood and other commonly used dice-making material.