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Vigesimal
The vigesimal or base 20 numeral system is based on twenty (in the same way in which the decimal numeral system is based on ten).

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Numeral System
A numeral system (or system of numeration) 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. It can be seen as the context that allows the symbols "11" to be interpreted as the binary symbol for three, the decimal symbol for eleven, or a symbol for other numbers in different bases. The number the numeral represents is called its value. Ideally, a numeral system will: For example, the usual decimal representation of whole numbers gives every nonzero whole number a unique representation as a finite sequence of digits, beginning with a non-zero digit
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Āryabhaṭa Numeration
The Alphabet of Sanskrit transliteration" xml:lang="sa-Latn">Āryabhaṭa numeration is a system of numerals based on Sanskrit phonemes. It was introduced in the early 6th century in India by Alphabet of Sanskrit transliteration" xml:lang="sa-Latn">Āryabhaṭa, in the first chapter titled Gītika Padam of his Aryabhatiya
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Cyrillic Numerals
Cyrillic numerals are a numeral system derived from the Cyrillic script, developed in the First Bulgarian Empire in the late 10th century
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Greek Numerals
Greek numerals, also known as Ionic, Ionian, Milesian, or Alexandrian numerals, are a system of writing numbers using the letters of the Greek alphabet. In modern Greece, they are still used for ordinal numbers and in contexts similar to those in which Roman numerals are still used elsewhere in the West
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Hebrew Numerals
The system of Hebrew numerals is a quasi-decimal alphabetic numeral system using the letters of the Hebrew alphabet. The system was adapted from that of the Greek numerals in the late 2nd century BC. The current numeral system is also known as the Hebrew alphabetic numerals to contrast with earlier systems of writing numerals used in classical antiquity. These systems were inherited from usage in the Aramaic and Phoenician scripts, attested from c. 800 BC in the so-called Samaria ostraca and sometimes known as Hebrew-Aramaic numerals, ultimately derived from the Egyptian Hieratic numerals. The Greek system was adopted in Hellenistic Judaism and had been in use in Greece since about the 5th century BC. In this system, there is no notation for zero, and the numeric values for individual letters are added together
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Roman Numerals
The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers in this system are represented by combinations of letters from the Latin alphabet"> Latin alphabet. Roman numerals, as used today, are based on seven symbols:
Symbol I V X L C D M
Value 1 5 10 50 100 500 1,000
The use of Roman numerals continued long after the decline of the Roman Empire
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Aegean Numerals
Aegean numbers was the numeral system used by the Minoan and Mycenaean civilizations. They are attested in Linear A and Linear B scripts
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Babylonian Numerals
Babylonian numerals were written in cuneiform, using a wedge-tipped reed stylus to make a mark on a soft clay tablet which would be exposed in the sun to harden to create a permanent record. The Babylonians, who were famous for their astronomical observations and calculations (aided by their invention of the
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Abjad Numerals
The Abjad numerals are a decimal numeral system in which the 28 letters of the Arabic alphabet"> Arabic alphabet are assigned numerical values. They have been used in the Arabic-speaking world since before the eighth century when Arabic numerals"> Arabic numerals were adopted. In modern Arabic, the word abjadīyah means 'alphabet' in general. In the Abjad system, the first letter of the Arabic alphabet, alif, is used to represent 1; the second letter, bāʾ, is used to represent 2, etc. Individual letters also represent 10s and 100s: yāʾ for 10, kāf for 20, qāf for 100, etc. The word abjad ( Arabic language text" xml:lang="ar">أبجد) itself derives from the first four letters (A-B-G-D) in the Phoenician alphabet, Aramaic alphabet, Hebrew alphabet and other scripts for Semitic languages
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Egyptian Numerals
The system of ancient Egyptian numerals was used in Ancient Egypt from around 3000 BC 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
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Etruscan Numerals
The Etruscan numerals were used by the ancient Etruscans. The system was adapted from the Greek Attic numerals and formed the inspiration for the later Roman numerals via the Old Italic script.
Etruscan Arabic Symbol * Old Italic
θu 1 Etruscan Numeral 1.svg 𐌠
maχ 5 Etruscan Numeral 5.svg 𐌡
śar 10 Etruscan Numeral 10.svg 𐌢
muvalχ 50 Etruscan Numeral 50.svg 𐌣
? 100 Etruscan Numeral 100.svg or C 𐌟
There is very little surviving evidence of these numerals
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