This page aims to document the Unicode coverage of all the fonts (including non-free ones) in Debian. It was created using fontforge, font-manager and gucharmap. You should also read the DebianInstaller/GUIFonts page to find out about the fonts used by the installer.
Please add any fonts which might fill in some of these blocks to the Fonts/Missing page.
TODO: automatically create this page based on the latest unicode-data package as well as all fonts in Debian unstable, using the fonts review:
Firefox seems to render all Wikipedia languages:
With missing characters mentioned, most of these are available as bitmap glyphs in Unifont or Unifont Upper.
Arabic extended A: U+08D3
Armenian: U+0560 and U+0588
Bengali: U+09FC to U+09FE
Devanagari extended: U+A8FE and U+A8FF
Georgian extended: U+1C90 to U+1CBA and U+1CBD to U+1CBF
Gujarati: U+0AFA to U+0AFF
Ideographic symbols and punctuation U+16FE1
Kharoshthi: U+10A34, U+10A35 and U+10A48
Latin extended D: U+A7AF, U+A7B8 and U+A7B9
Miscellaneous symbols and arrows: U+2BD3 to U+2BE7 and U+2BF0 to U+2BFE
N'Ko: U+07FD to U+07FF
Supplemental punctuation: U+2E4A to U+2E4E
Tangut U+17002 to U+17004, U+17006 to U+1702F, U+17032 to U+17037 and U+17039 to U+187F1
Tangut components U+1880C to U+1880F, U+18811, U+18813, U+18816 to U+18818, U+1881C to U+1881F, U+18825, U+18826, U+18829, U+1882E to U+18830, U+18834 to U+1883C, U+1883E to U+1884C, U+1884E to U+18852, U+18857, U+18859, U+1885A, U+1885D, U+1885E, U+18860, U+18865, U+18867, U+18868, U+1886B to U+1886E, U+18870 to U+1887C, U+1887E to U+18881, U+18883 to U+1889B, U+1889D to U+188AF, U+188B1 to U+188C6, U+188C8 to U+188D6, U+188D9 to U+188E8, U+188EA to U+18919, U+1891E, U+18921 to U+18942, U+18946 to U+18959, U+1895B to U+18975, U+18977 to U+18AD4 and U+18AD6 to U+18AF2
Vedic extensions U+1CF7
Completely empty blocks
Most of these blocks have bitmap glyphs available in Unifont or Unifont Upper.
Gunjala Gondi (U+11D60...)
Hanifi Rohingya (U+10D00...)
Indic Siyaq numbers (U+1EC71...)
Masaram Gondi (U+11D00...)
Mongolian supplement (U+11660...)
Old Sogdian (U+10F00...)
Sutton signwriting (U+1D800...)
Syriac supplement (U+0860...)
Zanabazar square (U+11A00...)
Some conscripts in the ConScript Unicode Registry (such as Klingon, Tengwar and Visible speech) have bitmap glyphs available in Unifont CSUR.