Add name for the "whitespace glyph" symbol.

[zacharie-moughanim]

The "whitespace glyph" is the symbol often used to designate the spacebar on keyboards : ␣.
I'm honestly not sure about the name, nor if it is pertinent to put it as a variant of space, which always designate whitespaces.

[MDLC01]

Note that a similar character exists in Unicode: U+2420 ␠ SYMBOL FOR SPACE. Both come from the Control Pictures block.

[Enivex]

The name in html is blank, but https://www.compart.com/en/unicode/U+2422 also exists

[zacharie-moughanim]

Maybe we could remove forget about the name space.glyph, add the name blank and group ␣, U+2420, U+2422 as variants of this name, what do you think ?

[MDLC01]

According to French Wikipédia, U+2422 ␢ is used in theoretical computer science.¹ I am struggling to find uses of this symbol other than the book mentioned on this page, and unable to locate the proposal that lead to its inclusion to Unicode. I do not know whether we actually want to assign it a name.

My intuition is that the graphic pictures for control codes (i.e., 2400..2421 and 2424) should be in their own sub-module because they are so clearly related without being variants of each others. Then, U+2423 ␣ could either be a variant of U+2420 ␠ and U+2422 ␢ sym.blank, or U+2423 ␣ could be its own symbol outside of the sub-module but that causes a potential collision if we want to include U+2422 ␢ as well.

Footnotes

1. https://fr.wikipedia.org/wiki/%C9%83#Symbole_blanc ↩

[MDLC01]

Also, don't forget to update the changelog to mention the addition(s).