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  2. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    In photography, Roman numerals (with zero) are used to denote varying levels of brightness when using the Zone System . In seismology, Roman numerals are used to designate degrees of the Mercalli intensity scale of earthquakes. Example of postage stamp from Ireland (Éire) franked using Roman numeral for the month.

  3. Arabic numerals - Wikipedia

    en.wikipedia.org/wiki/Arabic_numerals

    The term often also implies a positional notation using the numerals, as well as the use of a decimal base, in particular when contrasted with other systems such as Roman numerals. However, the symbols are also used to write numbers in other bases such as octal , as well as for writing non-numerical information such as trademarks or license ...

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    A binary clock might use LEDs to express binary values. In this clock, each column of LEDs shows a binary-coded decimal numeral of the traditional sexagesimal time.. The common names are derived somewhat arbitrarily from a mix of Latin and Greek, in some cases including roots from both languages within a single name. [25]

  5. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent different numbers in different numeral systems. For example, "11" represents the number eleven in the decimal or ...

  6. Greek numerals - Wikipedia

    en.wikipedia.org/wiki/Greek_numerals

    The first line contains the number " ͵θϡϟϛ δʹ ϛʹ ", i.e. " 9,996 + 1⁄4 + 1⁄6 ". It features each of the special numeral symbols sampi (ϡ), koppa (ϟ), and stigma (ϛ) in their minuscule forms. Greek numerals are decimal, based on powers of 10. The units from 1 to 9 are assigned to the first nine letters of the old Ionic alphabet ...

  7. Ancient Roman units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Roman_units_of...

    The basic unit of Roman linear measurement was the pes (plural: pedes) or Roman foot. Investigation of its relation to the English foot goes back at least to 1647, when John Greaves published his Discourse on the Romane foot. Greaves visited Rome in 1639, and measured, among other things, the foot measure on the tomb of Titus Statilius Aper ...

  8. Egyptian numerals - Wikipedia

    en.wikipedia.org/wiki/Egyptian_numerals

    The system of ancient Egyptian numerals was used in Ancient Egypt from around 3000 BC [1] until the early first millennium AD. It was a system of numeration based on multiples of ten, often rounded off to the higher power, written in hieroglyphs .

  9. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used inclusively of the Julian calendar established by the reforms of the Dictator Julius Caesar and Emperor Augustus in the late 1st century BC. [ a ]