surds:- if this is for the Mail on Sunday GK crossword YES IT IS
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"arithmetical expressions" may be what you are seeking.
16-2
An expression
A mathematical phrase that contains operations, numbers, or variables is called an algebraic expression. Algebraic expressions consist of constants (numbers), variables (letters representing unknown quantities), and mathematical operations such as addition, subtraction, multiplication, division, and exponentiation. These expressions can be simplified, evaluated, or manipulated using algebraic rules and properties.
They are irrational numbers!