olemus
ISO/IEC 2382:
nõutava esitustäpsuse saamiseks kaht arvutisõna kasutav
=
characterized by the use of two computer words to represent a number in accordance with the required precision

ülevaateid
https://en.wikipedia.org/wiki/Double-precision_floating-point_format

http://web.mit.edu/hyperbook/Patrikalakis-Maekawa-Cho/node47.html

https://borninsummer.com/files/2018/06/Double-precision-floating-point-format-Wikipedia.pdf