New answers tagged ttf
vinc17 is correct: The glyph ☠, also called SKULL AND CROSSBONES, is not supported by Liberation Mono font as you can see here and here. You have to change to a font that covers this unicode (range). Fonts that support this particular glyph ☠ are listed here. To find the name and various other information of a unicode character by text, use this tool.
The Liberation font doesn't seem to have this symbol. But using XTerm*faceName: DejaVu Sans Mono (which is also a truetype font) allows ☠ to be displayed. EDIT: Do not use LibreOffice or OpenOffice to determine whether a glyph is supported in a font, as it silently falls back to another font: OpenOffice bug 45128.
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