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I assume that the expression is 4/5 (thanks to the rubbish browser, the division symbol is not visible). In that case, 5 is the denominator (or divisor).
The symbol 'π' is the Greek letter 'p' which is called "pi", like our 'p' is called 'pee'.
A power or exponent.
In an expression p4 is called a term.
The expression of a gene is called the phenotype.