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(emacs)Undisplayable Characters

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Undisplayable Characters
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   Your terminal may be unable to display some non-ASCII characters.
Most non-windowing terminals can only use a single character set (use
the variable `default-terminal-coding-system' (Note: Specify Coding)
to tell Emacs which one); characters which can't be encoded in that
coding system are displayed as `?' by default.

   Windowing terminals can display a broader range of characters, but
you may not have fonts installed for all of them; characters that have
no font appear as a hollow box.

   If you use Latin-1 characters but your terminal can't display
Latin-1, you can arrange to display mnemonic ASCII sequences instead,
e.g. `"o' for o-umlaut.  Load the library `iso-ascii' to do this.

   If your terminal can display Latin-1, you can display characters
from other European character sets using a mixture of equivalent
Latin-1 characters and ASCII mnemonics.  Use the Custom option
`latin1-display' to enable this.  The mnemonic ASCII sequences mostly
correspond to those of the prefix input methods.