If you mean floating point number, they are significand, base and exponent.

Yes.

Yes.

Yes.

Yes.

"Floating Point" refers to the decimal point. Since there can be any number of digits before and after the decimal, the point "floats". The floating point unit performs arithmetic operations on decimal numbers.

The mantissa - also known as a significand or coefficient - is the part of a floating-point number which contains the significant digits of that number.

In the common IEEE 754 floating point standard, the mantissa is represented by 53 bits of a 64-bit value (double) and 24 bits of a 32-bit value (single).

Assuming you're asking about IEEE-754 floating-point numbers, then the three parts are base, digits, and exponent.