Computing term for the decimal point character used in a specific locale or data representation, as opposed to a generic or expected one.
In this system, a period is used as the actual decimal point.
小数点 is the general term for 'decimal point'; 実際の小数点 specifies the actual character used in a given context.
Compound of 実際 (actual) + の (possessive particle) + 小数点 (decimal point).