Some languages, but not English, have regulators such as the Académie
française (French Academy). Amongst other things, it decides whether or not
English words such as email, software and ウォークマン ought to be in the French
language, or should be replaced with French-derived terms like courriel,
logiciel and baladeur.

Wikipedia says the Agency for Cultural Affairs (文化庁) at the Ministry of
Education of Japan (文部科学省) plays a role in [language
regulation](http://en.wikipedia.org/wiki/List_of_language_regulators).
Previous questions have mentioned that the government has deprecated
[hentaigana](http://en.wikipedia.org/wiki/Hentaigana) and certain
[kanji](https://japanese.stackexchange.com/questions/531/on-the-replacing-of-
kanji-obsoleted-in-the-1946-reforms-with-similar-looking-kan). Does any other
form of language regulation occur, either by the Japanese government, or
organizations theoretically independent of it?
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history language-reform
How is Japanese regulated by the Japanese government and any other organizations?
Well the government can and does regulate the words that and characters that
can be used in both official documents, government signage and legal names.

They also set the minimum education standards for Japanese language. So kids
have to learn kanji and learn it in a specific form.

While they can't go and take your book of out circulation or take down your
store's signage if it doesn't match their standard, they effectively ensure
that future generations will tend to favor not using characters and words that
the government considers obsolete or useless.
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文化庁 also publish guidelines on okurigana, the writing of gairaigo, and the use
of romaji. Those can be seen
[here](http://www.bunka.go.jp/kokugo_nihongo/joho/kijun/naikaku/index.html).
Other documents
[here](http://www.bunka.go.jp/kokugo_nihongo/joho/kijun/sanko/index.html)
include guidelines on the use of punctuation, iteration marks, etc.

There is also 国立国語研究所. Although they're researchers not regulators, they have
produced documents on how to reword difficult-to-understand gairaigo using
kanji terms ([「外来語」言い換え提案](http://www.ninjal.ac.jp/gairaigo/)).

Finally, the Japanese Industrial Standards Committee (日本工業標準調査会), through the
JIS X 208 and JIS X 0213 standards, has a big influence. If you can't (or
can't easily) enter/display certain characters on your computer/phone, that's
going to affect usage, even if you don't really care about government
standards and guidelines.
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This is a **partial** answer specifically about **government kanji lists**
(prior answers did not go into detail).

MEXT (文部省) and MOJ (法務省) publish official kanji lists (漢字表) like
[常用漢字表](http://www.mext.go.jp/b_menu/hakusho/nc/k19811001001/k19811001001.html)
(MEXT) and [人名用漢字票](http://www.moj.go.jp/content/001131003.pdf) (MOJ). The
former is a list of about 2000 kanji "for every day use" (常用) that schools
teach and children are expected to learn in school. The second is a
supplementary list of about 1000 kanji "for use in names" (人名用), that are not
judged to be particularly common outside use in names. **The union of these
sets represents kanji that are "legally recognized"** (can be used in legal
documents without issue, etc).

Note that native speakers generally learn to recognize/read many kanji beyond
what is in the government lists ( **the lists account for about 3000
"official" kanji** ). (See note below on numbers beyond "government
recognized" kanji)

MEXT further divides the 常用 list. A subset of 1006 kanji is called the
[教育漢字表](http://www.mext.go.jp/a_menu/shotou/new-cs/youryou/syo/koku/001.htm),
or "educational kanji list", which is further separated by grade level and is
taught in elementary school. First graders learn 80 kanji (plus hiragana and
katakana). Second graders learn another 160, third and fourth graders learn
200 a piece, fifth graders learn 185, and sixth graders learn 181.

These lists are not the first versions. The government has published kanji
lists in the past, but the older ones have been replaced by the newest
iterations.

* * *

**Aside:** How many kanji are there, and **how many do native speakers know?**
It is hard to give an estimate. To give an idea of how many kanji exist that
are relevant to Japanese, [Wikipedia](https://en.wikipedia.org/wiki/Kanji)
suggests that a dictionary containing 50,000 unique kanji is considered
comprehensive (but of course many of these are outdated or specialist-only),
and that JIS standards call for computer encodings of 13,000 kanji, with the
main range including 6,000. I queried the JMDIC data set, which contains
spellings of Japanese words representing close to 6,000 kanji, with close to
3,000 of these being in words marked "common". The [Kanji
Kentei](https://en.wikipedia.org/wiki/Kanji_kentei) Pre-1 and 1 levels have
low pass rates even among adult native speakers, but they require very in-
depth reading and hand-writing knowledge of ~3,000 and ~6,000 respectively. To
me it seems reasonable to say that a typical native speaker will have some
familiarity with readings or meanings of between 3,000 to 13,000 kanji, but a
more precise number would be very sensitive to a definition of "familiarity"
and background of the native speaker.
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