Clara HD Solved: Clara HD ℤ (double-struck zed?) not displayed

[Suffolk Punch]

My Clara HD doesn't display ℤ (double-struck capital zed) in an epub e-book I'm reading. It just displays a space. What's odd is that the Calibre e-book reader *does* display ℤ when I open the epub in it.

The double-struck zed is commonly used to denote fields or rings of integers. So e.g. ℤ₆ is the ring of integers modulo 6 {0,1,2,3,4,5}.

In the Clara HD the epub's font face is set to 'Publisher Default'. I tried the supplemental fonts but without success.

Can anyone suggest a way to display ℤ?

[DNSB]

Originally Posted by Suffolk Punch

Can anyone suggest a way to display ℤ?

If you are reading a kepub, you could try to select a secondary font that has the ℤ ( & #8484; ) as a glyph. If you are reading an epub, you would need to select a font that has that glyph as your reading font or embed a font that has that glyph and select that font for that character. NotoSerif, Arial Unicode MS and Code2000 are fonts that have that glyph. Of that 3, NotoSerif is the only one that I find usable for reading.

[Suffolk Punch]

Originally Posted by DNSB

If you are reading a kepub, you could try to select a secondary font that has the ℤ ( & #8484; ) as a glyph. If you are reading an epub, you would need to select a font that has that glyph as your reading font or embed a font that has that glyph and select that font for that character. NotoSerif, Arial Unicode MS and Code2000 are fonts that have that glyph. Of that 3, NotoSerif is the only one that I find usable for reading.

Thanks. I am reading a kepub. Searched https://fonts.google.com/noto/specim...ery=noto+serif but couldn't find ℤ. Any further hints would be appreciated!

[Aleron Ives]

Changing fonts is the only solution. If you can't see a particular glyph, you need to use a font that contains said glyph.

[DNSB]

Originally Posted by Suffolk Punch

Thanks. I am reading a kepub. Searched https://fonts.google.com/noto/specim...ery=noto+serif but couldn't find ℤ. Any further hints would be appreciated!

Here's a screen shot showing the glyph at 0x2124 in Noto Serif v2.013.

[Suffolk Punch]

Originally Posted by DNSB

Here's a screen shot showing the glyph at 0x2124 in Noto Serif v2.013.

Thanks again! There's something about fonts and scripts I don't yet get!

I attach a snapshot of Gnome Char Map. It shows the double struck Z for the Times new Roman font and 'common' script. I get a similar thing with Noto Serif Regular font and the 'common' script.

What exactly are scripts in this context? And what font files do I need to copy to my Clara HD's font folder to get the double-struck Z displayed?

[Suffolk Punch]

Update: I have finally got ℤ to be displayed by my Clara HD. I copied the font 'NotoSerif-VariableFont_wdth,wght.ttf' to the Clara's fonts folder, then selected the 'face font' in the epub settings to be 'Noto Serif'.

One correction to my earler post. Gnome Char Map should have selected 'View > Show only glyphs from this font'. Then the TimesNewRoman font would NOT have been shown as containing the ℤ glyph; and the NotoSerif font would have.

Thanks to everyone for helping.

[DNSB]

I've seen that issue before where a freeware font inspection tool would fill in any missing glyphs by using a different font on my computer that had the glyph. I noticed it when I was looking at Courier New and it showed a mass of CJK glyphs. Time for an uninstall.

[Quoth]

Originally Posted by DNSB

I've seen that issue before where a freeware font inspection tool would fill in any missing glyphs by using a different font on my computer that had the glyph. I noticed it when I was looking at Courier New and it showed a mass of CJK glyphs. Time for an uninstall.

What on earth is the point of a font viewer that fills in missing glyphs? Even an option to do that should not exist or be only a a temporary check box for that view at that time (so you see what maybe ought be there, but that's a guess).