Editing Numerical digit (section)

===In computer science===
The [[Binary numeral system|binary]] (base&nbsp;2), [[octal]] (base&nbsp;8), and [[hexadecimal]] (base&nbsp;16) systems, extensively used in [[computer science]], all follow the conventions of the [[Hindu–Arabic numeral system]].<ref>{{Cite book|last=Ravichandran|first=D.|url=https://books.google.com/books?id=EHNOHAjXdQcC&q=octal|title=Introduction To Computers And Communication|date=2001-07-01|publisher=Tata McGraw-Hill Education|isbn=978-0-07-043565-0|language=en|pages=24–47}}</ref> The binary system uses only the digits "0" and "1", while the octal system uses the digits from "0" through "7". The hexadecimal system uses all the digits from the decimal system, plus the letters "A" through "F", which represent the numbers 10 to 15 respectively.<ref>{{Cite web|title=Hexadecimals|url=https://www.mathsisfun.com/hexadecimals.html|access-date=2020-07-22|website=www.mathsisfun.com}}</ref> When the binary system is used, the term "bit(s)" is typically used as an alternative for "digit(s)", being a portmanteau of the term "binary digit".