Some Unicode characters that are not displayed on the Kindle

I am implementing a book for a Kindle device using HTML, but some special Unicode characters are not displayed in Kindle, for example:

    X -hax: x̄ 
    X-double bar : x̿
    R- hax : ͞R

My title tag:

<head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>

Please help me; how can I display the above characters (and shown below if your browser has sufficient Unicode support):

  •   ̿ U + 033F COMBINING DOUBLE OVERLINE
  •   ͞ U + 035E COMBINING DOUBLE MACRON
  • ݲ U + 0772 ARABIC LETTER HAH WITH SMALL ARABIC LETTER TAH ABOVE
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3 answers

, Unicode.

.

: : ₸ enter image description here

edit:. , PHP GD/Freetype2 , PHP6 , GD Pango:

https://bugs.php.net/bug.php?id=34670

+1

, , .

, Windows/Unix .

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amazon kindle

Here's the link

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