When (or how) were simplified numbers in Japanese used e.g. mi = 3, na = 7, etc


There seems to be a cultural convention in Japanese that allows for "old"
(simplified) versions of numbers to be used. An example of this would be the
idol group 3776 which is known as "minanaro" and not "san-nana-nana-roku" as
might be expected. This is similar to the old timekeeping system whereby
simplified versions of zodiac animal names were used e.g. ね instead of ねずみ for
rat, etc.

Is there a standardised list of simplified numbers, and when and how were they
used? Is there a reason why the numbers are a mixture of simplified kunyomi
and onyomi readings? Also, does the use of these numbers convey a certain
sentiment e.g. does it sound deliberately archaic to use these numbers, or
more sophisticated?

Thank you in advance for any input!




The following Wikipedia article should help:

  * [語呂合わせ#数字の暗記](https://ja.wikipedia.org/wiki/%E8%AA%9E%E5%91%82%E5%90%88%E3%82%8F%E3%81%9B#%E6%95%B0%E5%AD%97%E3%81%AE%E6%9A%97%E8%A8%98)

Reading 7 as な is not exactly a 'reading'. It is just shortened for the
resulting reading to make sense. In case you are not aware, 3776 is the height
of Mt. Fuji, みななろ is the mnemonic to remember it (日本一にみななろう literally: Let us
all become No.1 in Japan).

The wordplay is common in remembering years of historical events as described
in the link, and also for telephone numbers. Taking an example from
[here](https://ryoban-s.jp/goro_sample/) 025 is read レッツゴー(let's go), where 0
is read れ (from れい), 2 as つ (from two=ツー), and 5 as ご.

* * *

To clarify:

  * _Is there a standardised list of old (simplified) numbers, and when and how were they used?_

Please look at the Wikipedia, but there is nothing standardized - to some
extent the 'reading' is arbitrary.

  * _Is there a reason why the numbers are a mixture of simplified kunyomi and onyomi readings?_

It is read that way so that the reading makes sense as a phrase in Japanese.

  * _does the use of these old numbers convey a certain sentiment?_

Although many 語呂合わせ has been around for some time and some of them are oldish,
but as you can see in 025, these are not particularly associated with
archaism. The intention is (mostly) to help people remember the number.

* * *

Related question:

  * [What is the meaning of 富士山麓オウム返しに?](https://japanese.stackexchange.com/q/99988/45489)

* * *

As for the reading of numerals + counters,
[NHK発音アクセント新辞典](https://www.nhk.or.jp/bunken/accent/index.html) lists the
reading for many combinations. You can see a sample in the right bottom of
[this pdf](https://www.nhk.or.jp/bunken/research/kotoba/pdf/20160901_5.pdf).




The following Wikipedia article should help:

  * [語呂合わせ#数字の暗記](https://ja.wikipedia.org/wiki/%E8%AA%9E%E5%91%82%E5%90%88%E3%82%8F%E3%81%9B#%E6%95%B0%E5%AD%97%E3%81%AE%E6%9A%97%E8%A8%98)

Reading 7 as な is not exactly a 'reading'. It is just shortened for the
resulting reading to make sense. In case you are not aware, 3776 is the height
of Mt. Fuji, みななろ is the mnemonic to remember it (日本一にみななろう literally: Let us
all become No.1 in Japan).

The wordplay is common in remembering years of historical events as described
in the link, and also for telephone numbers. Taking an example from
[here](https://ryoban-s.jp/goro_sample/) 025 is read レッツゴー(let's go), where 0
is read れ (from れい), 2 as つ (from two=ツー), and 5 as ご.

* * *

To clarify:

  * _Is there a standardised list of old (simplified) numbers, and when and how were they used?_

Please look at the Wikipedia, but there is nothing standardized - to some
extent the 'reading' is arbitrary.

  * _Is there a reason why the numbers are a mixture of simplified kunyomi and onyomi readings?_

It is read that way so that the reading makes sense as a phrase in Japanese.

  * _does the use of these old numbers convey a certain sentiment?_

Although many 語呂合わせ has been around for some time and some of them are oldish,
but as you can see in 025, these are not particularly associated with
archaism. The intention is (mostly) to help people remember the number.

* * *

Related question:

  * [What is the meaning of 富士山麓オウム返しに?](https://japanese.stackexchange.com/q/99988/45489)

* * *

As for the reading of numerals + counters,
[NHK発音アクセント新辞典](https://www.nhk.or.jp/bunken/accent/index.html) lists the
reading for many combinations. You can see a sample in the right bottom of
[this pdf](https://www.nhk.or.jp/bunken/research/kotoba/pdf/20160901_5.pdf).

