Double-precision floating-point format, often abbreviated as "double", is a computer number format that uses 64 bits to represent real numbers, providing a higher level of precision and range compared to single-precision floating-point format, which uses 32 bits.
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A floating-point representation occupying bits, or bytes, with one sign bit, exponent bits and explicitly stored fraction bits. The implicit leading bit of a normal number gives bits of significand precision. Near one, adjacent numbers are separated by ; rounding to nearest has unit roundoff in the normal range. These are relative precision scales, distinct from underflow limits or a universal absolute error bound.[ref]
IEEE arithmetic in Oracle's Numerical Computation Guide. Chapter 2, IEEE Arithmetic Model and Double Format, Table 2-5