What is the division between whole numbers and fractional numbers in any base other than decimal?

The correct answer focuses on the term "radix point," which is used in numeral systems to denote the division between the whole number part and the fractional part of a number. In any base (or radix) system, the radix point plays a similar role to what the decimal point does in the decimal (base-10) system.

For example, in a binary (base-2) system, a number written as "101.01" consists of a whole number (101 in binary) and a fractional part (01 in binary). The radix point indicates how the base affects the value represented by the digits to the left and right of it. This concept is essential for understanding numerical representations in various bases, including binary, octal, and hexadecimal.

The other terms do not accurately reflect this function in numeral systems. The term "numeric limit" does not convey the relationship between whole and fractional parts. While the "decimal point" is specific to the decimal system, the "radix point" is applicable to any base. "Invariant point" is not a standard term used to describe this division in numeral systems. Thus, the significance of the radix point lies in its universal application across different bases.