!!! Overview
[{$pagename}], generally, are those which are not in the standard [ASCII] character set, which uses 7-bit characters and thus has values 0 to 127. 


[ASCII] Codes 0 to 31 and 127 are non-printing control characters, while codes 32 to 126 match the keys on a US keyboard ("a", "A", etc.).

!! Using 8 Bits Gives You an Extra 96 Characters
Since computers store characters in 8-[bits], many uses have been found for the extra 128 values, most commonly for European characters such as A with Grave accent (À). 

And actually, only 96 of the codes are used 
* values 128 to 159 are not assigned Graphics, just as 0 to 31 are reserved for non-printing control characters.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }] 
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* [#1] - [Extended Characters and MPE|http://www.robelle.com/smugbook/extchar.html#:~:text=Extended%20characters%20are%20those%20which,A%22%2C%20etc.).|target='_blank'] - based on information obtained 2020-12-17