An expression.
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It is called an expression.
That sounds like the description of an "expression", except for one detail: an expression MAY have operations, but also, it may not, since numbers and variables are themselves expressions.
In a set of numbers, the difference between the greatest and the least is called the range.
The smallest number that can be divided by two or more different denominators is the "least common multiple" or LCM of those numbers.
An expression.