List of undeciphered writing systems

See also Undeciphered writing systems and Inscriptions in undeciphered writing systems.
Most have 'become undecipherable': the users of the script have died out and there is no equivalent of the Rosetta Stone or a 'bilingual dictionary'.
From the Wikipedia category list and other sources.
*The Alekanovo inscription
*Anra scarab
*Banpo symbols
*Ba–Shu scripts
*Basarabi Cave Complex
*Byblos syllabary
*Cascajal Block
*Cretan hieroglyphs
*Cretan hieroglyphs
*Cypro-Minoan syllabary
*Dandaleith stone
*Dispilio Tablet
*Espanca script
*Iberian scripts
*Indus script
*Issyk writing
*Isthmian script
*Jiahu symbols
*Khitan scripts - including Khitan large script and Khitan small script
*Kohi script
*Linear A
*Linear Elamite
*Mixtec writing
*Megalithic graffiti symbols
*Murfatlar Cave Complex
*Nsibidi
*Numidian language
*Phaistos Disc
*Proto-Elamite
*Proto-Sinaitic script
*Pushkarasari script
*Quipu
*Rongorongo
*Singapore Stone
*Sitovo inscription
*Southwest Paleohispanic script
*Trojan script
*Tujia script
*Vinča symbols
*Voynich Manuscript
*Zapotec writing
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