Double digits refers to a number that has two digits, specifically from 10 to 99. However, there are various synonyms that can be used to describe this term. Some of these synonyms include two digits, two-figure numbers, double numeral, dual digits, and double-digit figures. All these synonyms can be used interchangeably to refer to any number that consists of two digits. Depending on the context, some of these synonyms may be more appropriate than others. For example, "two-figure number" may be more appropriate in a formal setting while "double digits" may be used more casually. In any case, all these synonyms convey the same meaning of two digits.