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Japanese writing
Components
Kanji Stroke order Radicals Kyōiku kanji Jōyō kanji (Tōyō kanji) Jinmeiyō kanji Hyōgai kanji List of kanji by stroke count
Kana Hiragana Katakana Hentaigana Man'yōgana Sōgana Gojūon
Typographic symbols Japanese punctuation Iteration mark
Uses
Syllabograms Furigana Okurigana Braille
Transliteration
Rōmaji Hepburn (colloquial) Kunrei (ISO) Nihon (ISO transliteration) JSL (transliteration) Wāpuro (keyboard)
Cyrillization Polivanov system
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The romanization of Japanese is the use of Latin script to write the Japanese language.^[1] This method of writing is sometimes referred to in Japanese as rōmaji (ローマ字, lit. 'Roman letters', [ɾoːma(d)ʑi] ^ⓘ or [ɾoːmaꜜ(d)ʑi]).

Japanese is normally written in a combination of logographic characters borrowed from Chinese (kanji) and syllabic scripts (kana) that also ultimately derive from Chinese characters.

There are several different romanization systems. The three main ones are Hepburn romanization, Kunrei-shiki romanization (ISO 3602) and Nihon-shiki romanization (ISO 3602 Strict). Variants of the Hepburn system are the most widely used.

Romanized Japanese may be used in any context where Japanese text is targeted at non-Japanese speakers who cannot read kanji or kana, such as for names on street signs and passports and in dictionaries and textbooks for foreign learners of the language. It is also used to transliterate Japanese terms in text written in English (or other languages that use the Latin script) on topics related to Japan, such as linguistics, literature, history, and culture.

All Japanese who have attended elementary school since World War II have been taught to read and write romanized Japanese. Therefore, almost all Japanese can read and write Japanese by using rōmaji. However, it is extremely rare in Japan to use it to write Japanese (except as an input tool on a computer or for special purposes like in some logo design), and most Japanese are more comfortable in reading kanji and kana.

The earliest Japanese romanization system was based on Portuguese orthography. It was developed around 1548 by a Japanese Catholic named Anjirō.^{[2][citation needed]} Jesuit priests used the system in a series of printed Catholic books so that missionaries could preach and teach their converts without learning to read Japanese orthography. The most useful of these books for the study of early modern Japanese pronunciation and early attempts at romanization was the Nippo jisho, a Japanese–Portuguese dictionary written in 1603. In general, the early Portuguese system was similar to Nihon-shiki in its treatment of vowels. Some consonants were transliterated differently: for instance, the /k/ consonant was rendered, depending on context, as either c or q, and the /ɸ/ consonant (now pronounced /h/, except before u) as f; and so Nihon no kotoba ("The language of Japan") was spelled Nifon no cotoba. The Jesuits also printed some secular books in romanized Japanese, including the first printed edition of the Japanese classic The Tale of the Heike, romanized as Feiqe no monogatari, and a collection of Aesop's Fables (romanized as Esopo no fabulas). The latter continued to be printed and read after the suppression of Christianity in Japan (Chibbett, 1977).

From the mid-19th century onward, several systems were developed, culminating in the Hepburn system, named after James Curtis Hepburn who used it in the third edition of his Japanese–English dictionary, published in 1887. The Hepburn system included representation of some sounds that have since changed. For example, Lafcadio Hearn's book Kwaidan shows the older kw- pronunciation; in modern Hepburn romanization, this would be written Kaidan (lit. 'ghost tales').^{[citation needed]}

In the Meiji era (1868–1912), some Japanese scholars advocated abolishing the Japanese writing system entirely and using rōmaji instead. The Nihon-shiki romanization was an outgrowth of that movement. Several Japanese texts were published entirely in rōmaji during this period, but it failed to catch on. Later, in the early 20th century, some scholars devised syllabary systems with characters derived from Latin (rather like the Cherokee syllabary) that were even less popular since they were not based on any historical use of the Latin script.

Today, the use of Nihon-shiki for writing Japanese is advocated by the Oomoto sect^[3] and some independent organizations.^[4] During the Allied occupation of Japan, the government of the Supreme Commander for the Allied Powers (SCAP) made it official policy to romanize Japanese. However, that policy failed and a more moderate attempt at Japanese script reform followed.

Hepburn romanization generally follows English phonology with Romance vowels. It is an intuitive method of showing Anglophones the pronunciation of a word in Japanese. It was standardized in the United States as American National Standard System for the Romanization of Japanese (Modified Hepburn), but that status was abolished on October 6, 1994. Hepburn is the most common romanization system in use today, especially in the English-speaking world.

The Revised Hepburn system of romanization uses a macron to indicate some long vowels and an apostrophe to note the separation of easily confused phonemes (usually, syllabic n ん from a following naked vowel or semivowel). For example, the name じゅんいちろう is written with the kana characters ju-n-i-chi-ro-u, and romanized as Jun'ichirō in Revised Hepburn. Without the apostrophe, it would not be possible to distinguish this correct reading from the incorrect ju-ni-chi-ro-u (じゅにちろう). This system is widely used in Japan and among foreign students and academics.

Nihon-shiki romanization was originally invented as a method for Japanese to write their own language in Latin characters, rather than to transcribe it for Westerners as Hepburn was. It follows the Japanese syllabary very strictly, with no adjustments for changes in pronunciation. It has also been standardized as ISO 3602 Strict. Also known as Nippon-shiki, rendered in the Nihon-shiki style of romanization the name is either Nihon-siki or Nippon-siki.

Kunrei-shiki romanization is a slightly modified version of Nihon-shiki which eliminates differences between the kana syllabary and modern pronunciation. For example, the characters づ and ず are pronounced identically in modern Japanese, and thus Kunrei-shiki and Hepburn ignore the difference in kana and represent the sound in the same way (zu). Nihon-shiki, on the other hand, will romanize づ as du, but ず as zu. Similarly for the pair じ and ぢ, they are both zi in Kunrei-shiki and ji in Hepburn, but are zi and di respectively in Nihon-shiki. See the table below for full details.

Kunrei-shiki has been standardized by the Japanese Government and the International Organization for Standardization as ISO 3602. Kunrei-shiki is taught to Japanese elementary school students in their fourth year of education.

Written in Kunrei-shiki, the name of the system would be rendered Kunreisiki.

It is possible to elaborate these romanizations to enable non-native speakers to pronounce Japanese words more correctly. Typical additions include tone marks to note the Japanese pitch accent and diacritic marks to distinguish phonological changes, such as the assimilation of the moraic nasal /ɴ/ (see Japanese phonology).

JSL is a romanization system based on Japanese phonology, designed using the linguistic principles used by linguists in designing writing systems for languages that do not have any. It is a purely phonemic system, using exactly one symbol for each phoneme, and marking the pitch accent using diacritics. It was created for Eleanor Harz Jorden's system of Japanese language teaching. Its principle is that such a system enables students to internalize the phonology of Japanese better. Since it does not have any of the other systems' advantages for non-native speakers, and the Japanese already have a writing system for their language, JSL is not widely used outside the educational environment.

In addition to the standardized systems above, there are many variations in romanization, used either for simplification, in error or confusion between different systems, or for deliberate stylistic reasons.

Notably, the various mappings that Japanese input methods use to convert keystrokes on a Roman keyboard to kana often combine features of all of the systems; when used as plain text rather than being converted, these are usually known as wāpuro rōmaji. (Wāpuro is a blend of wādo purosessā word processor.) Unlike the standard systems, wāpuro rōmaji requires no characters from outside the ASCII character set.

While there may be arguments in favour of some of these variant romanizations in specific contexts, their use, especially if mixed, leads to confusion when romanized Japanese words are indexed. This confusion never occurs when inputting Japanese characters with a word processor, because input Latin letters are transliterated into Japanese kana as soon as the IME processes what character is input.

In addition, the following three "non-Hepburn rōmaji" (非ヘボン式ローマ字, hi-Hebon-shiki rōmaji) methods of representing long vowels are authorized by the Japanese Foreign Ministry for use in passports.^[5]

• oh for おお or おう (Hepburn ō).
• oo for おお or おう. This is valid JSL romanization. For Hepburn romanization, it is not a valid romanization if the long vowel belongs within a single word.
• ou for おう. This is also an example of wāpuro rōmaji.

This chart shows in full the three main systems for the romanization of Japanese: Hepburn, Nihon-shiki and Kunrei-shiki:

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