Apache PDF issue with Symbol.ttf

I have Symbol.ttf, configured the same in config file. Symbol font is not applying properly.

Please find the below details
FOP version - 1.0

OS - Unix, Windows

XSL-FO desc:
<fo:block font-family="Symbol">
Abcdefgh α β γ
</fo:block>
Result - the charcters are not displaying properly and they are not human readable format

fop.xconf:-
<renderers>
<renderer mime="application/pdf">
<fonts>
<font metrics-url="Symbol.xml" embed-url="Symbol.ttf">
<font-triplet name="Symbol" style="normal" weight="normal"/>
</font>
</fonts>
</renderer>

<renderers>