Hindu–Arabic numeral system system is based upon ten (originally nine) different glyphs. The symbols (glyphs) used to represent the system are in principle independent of the system itself. The glyphs in actual use are descended from Brahmi numerals and have split into various typographical variants since the Middle Ages. These symbol sets can be divided into three main families: Western Arabic numerals used in the Greater Maghreb and in Europe, Eastern Arabic numerals (also called "Indic numerals") used in the Middle East, and the Indian numerals used in South Asia. The Hindu-Arabic numerals were invented by mathematicians in India. Perso-Arabic mathematicians called them
Korean numerals tensed consonants when possible. Thus for example: Several numerals have long vowels, namely (two), (three) and (four), but these become short when combined with other numerals / nouns (such as in twelve, thirteen, fourteen and so on). The usual liaison and consonant-tensing rules apply, so for example, "yesun-yeoseot" (sixty-six) is pronounced like ("yesun-nyeoseot") and "chil-sip" (seventy) is pronounced like "chil-ssip". "Beon" (), "ho" (), "cha" (), and "hoe" () are always used with Sino-Korean or Arabic ordinal numerals. For example, "Yihoseon" () is Line Number Two in a metropolitan subway system. "Samsipchilbeongukdo" () is highway number 37. They cannot be