Arabic numerals milestone in the development of mathematics. One may distinguish between this positional "system", which is identical throughout the family, and the precise glyphs used to write the numerals, which varied regionally. The first universally accepted inscription containing the use of the 0 glyph in India is first recorded in the 9th century, in an inscription at Gwalior in Central India dated to 870. Numerous Indian documents on copper plates exist, with the same symbol for zero in them, dated back as far as the 6th century AD, but their dates are uncertain. Inscriptions in Indonesia and Cambodia dating to AD
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