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Is there a name to describe the situation where a particular
[character](http://en.wiktionary.org/wiki/character) is shown on a computer
screen in a particular [font](http://en.wiktionary.org/wiki/font#Noun_2), but
this font does not have a [glyph](http://en.wiktionary.org/wiki/glyph) for
this particular character?

Usually, the result looks like this: □  
A kind of empty rectangle. Sometimes it shows the code for that character
within the rectangle.

![tofubake](https://i.stack.imgur.com/jyyEl.png)

How do yo call this phenomenon in Japanese?  
If there is no name, is there a common term referring to this "missing glyph
square" in Japanese?

_(It is not[文字化け](http://en.wiktionary.org/wiki/mojibake). 文字化け happens when
[character encoding](http://en.wiktionary.org/wiki/character_encoding) meta-
information is lost. It is not the problem here. Using a better font solves
this phenomenon, but does not solve 文字化け. Selecting a character encoding
solves 文字化け, but does not solve this phenomenon.)_
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2012-03-28T11:03:50.440
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terminology computing
What to call the phenomenon where a rectangle is shown because a font is missing a glyph
It is still a case of
[文字化け](http://ja.wikipedia.org/wiki/%E6%96%87%E5%AD%97%E5%8C%96%E3%81%91#.E6.90.AD.E8.BC.89.E3.83.95.E3.82.A9.E3.83.B3.E3.83.88.E3.82.BB.E3.83.83.E3.83.88.E3.81.AE.E9.81.95.E3.81.84.E3.81.AB.E3.82.88.E3.82.8B.E3.83.88.E3.83.A9.E3.83.96.E3.83.AB).
文字化け means the phenomenon where characters are shown incorrectly on computers,
and its cause is not necessarily a mismatch of character encodings.

I do not know a specific term for the kind of 文字化け which you are talking
about. I would say something along フォントが足りないことによって起きる文字化け.

By the way, the glyphs used in this situation are technically called
[replacement glyphs](http://unicode.org/glossary/#R) in English. I do not know
how they are called in Japanese, but I guess that there is some technical term
for them in Japanese.

* * *

_Update_ : As Dono pointed out, some people use the word 文字化け in the narrower
sense which you explained in the question. (See the [note
page](http://ja.wikipedia.org/wiki/%E3%83%8E%E3%83%BC%E3%83%88%3a%E6%96%87%E5%AD%97%E5%8C%96%E3%81%91)
of the article in Japanese Wikipedia to see an example.) I do not know if
there is a better term which everyone agrees on.
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2012-03-28T12:20:01.923
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2012-03-28T12:44:01.393
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I propose: `suujibake` (数字ばけ). Cheers!
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2012-03-28T23:48:36.970
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As far as Internet slang goes, the word
[豆腐{とうふ}](http://ja.wikipedia.org/wiki/%E8%B1%86%E8%85%90) is often used as a
term for replacement glyphs because of their rectangular shapes, and 豆腐[化]{ば}け
or 豆腐[化]{か} describe the phenomenon in one word.

>   * 画面上の日本語がすべて豆腐になってしまっていて読めない
>   * フォント設定を変更しても豆腐化けが直らない
>
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2012-03-29T09:02:27.827
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2012-03-29T09:11:26.613
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