Unit prefix or if letters such as "T", which are already in use as SI units or prefixes, will again be skipped. Several personal proposals have been made for extending the series of prefixes, with ascending terms such as "xenna, weka, vendeka" (from Greek "ennea" (9), "deka" (10), "endeka" (11)) and descending terms such as "xono", "weco", "vundo" (from Latin "novem/nona" (9), "dec" (10), "undec" (11). Using Greek for ascending and Latin for descending would be consistent with established prefixes such as "deca, hecto, kilo" vs "deci, centi, milli"). Although some of these are repeated on the internet, none are in actual
Greek East and Latin West i.e. until the Roman conquests. At the start of late antiquity, beginning with the reorganization of the empire's provincial divisions during the reign of Diocletian (ruled 284–305), the expression "Greek East" evolved to stand in contradistinction to "Latin West". Thereafter, "Greek East" refers to the Greek-speaking provinces mentioned above (after 395 mostly in the Greek-speaking Eastern Roman Empire) in contradistinction to the provinces in Western Europe, Italia (excluding the Catepanate of Italy, where they still spoke Greek) and Northwest Africa (after 395 in the Latin-speaking Western Roman Empire). "Greek East" and "Latin West" are terms used also to divide Chalcedonian