A very naïve but logical question:

Why are these missing in the Hiragana chart?

  1. yi,

  2. ye,

  3. wu

If there are, where can I find them? How to write them?

[![enter image description
here](https://i.stack.imgur.com/bba5M.png)](https://i.stack.imgur.com/bba5M.png)
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question
pronunciation hiragana
Hiragana chart: yi, ye, wu - where and how?
These syllables simply don't appear in Modern Japanese, so there are no
standard symbols to represent them. This also goes for the "we" and "wi".
Their pronunciation has shifted from "we" to "e" and "wi" to "i", so in native
Modern Japanese words, you can find them written as pronounced.

Even if these syllables appear sometimes in loanwords, the katakana used to
represent them isn't the traditional "we" and "wi" katakana, rather the "U"
katakana plus a small vowel symbol, like in ウェスト [WeSUTO] (waist)
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They're not "missing", these hiragana characters aren't needed as they don’t
exist in modern Japanese language. The language doesn't have these sounds so
they did not need to be represented. You cannot write them in hiragana.

Some additional conventions exist to write foreign sounds in katakana but
there are still limitations as both systems were originally designed for
writing Japanese words. Until recently, these characters were only used to
represent sounds that exist in Japanese that can be spoken by a Japanese
reader. For example "wu" in chinese names is pronounced as "bu" in Japanese,
"gim" in Korean names is pronounced as "kim" in Japanese, "va" in European
names is pronounced as "ba" in Japanese. Furthermore "fu" and "hu" or "ra" or
"la" are not distinguished in Japanese loanwords from other languages.

There are several exceptions for historical reasons. "wi" (ゐ) and "we" (ゑ) are
used very rarely for names but are now pronounced the same as "i" (い) and "e"
(え) respectively. There is no longer any need to write them differently as the
sounds in modern Japanese are the same. Some brands still use it as their
original historical name such as "Yebisu" (ゑびす/ヱビス) beer.

Another source of confusion is inconsistent romanisation. The "ye" sound for
example, doesn’t exist in modern Japanese but ゑ was written as "we" or "ye"
since romanisation was not standardised at the time. This is also why 円 is
written as "Yen" in English, it was historically read as "wen" (ゑん) and is now
read as "en" えん. So despite non-standard romanisation suggesting it, the sound
"ye" doesn't have a hiragana character as it is not spoken in Japanese.
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answer
As others have said, they're not used in modern Japanese and the characters
aren't taught in Japanese Elementary schools. However, saying they don't exist
isn't technically correct; they do exist in an old textbook on Wikipedia. You
can find them here:
[ヤ行イ](http://ja.wikipedia.org/wiki/%E3%83%A4%E8%A1%8C%E3%82%A4)

Links to the specific kana charts for reference:

  * <https://ja.wikipedia.org/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Tuzurizi12.jpg>
  * <https://ja.wikipedia.org/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Syougaku11.jpg>

Edits: I misread the question originally and missed the specific context of
"yi", "ye, "wu". I don't know a modern specific situation where those have
been used.
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