Undeciphered writing systems

Certain forms of proto-writing remain undeciphered and, because of a lack of evidence and linguistic descendants, it is quite likely that they will never be deciphered.

• Jiahu symbols – Peiligang culture, from China, 7th millennium BC.
• Vinča symbols – Neolithic Europe, from Central Europe and Southeastern Europe, 6th millennium BC.
• Dispilio Tablet – Neolithic Europe, from Greece, 6th millennium BC.
• Banpo symbols – Yangshao culture, from China, 5th millennium BC.

The following is a list of undeciphered scripts from the Bronze Age (3300 to 1200 BC).

• Indus script – c. 3500 BC.
• Proto-Elamite – Elam, c. 3200 BC.
• Linear Elamite, c. 2200 BC.
• Linear A, c. 1900 BC, a syllabary.
• Cretan hieroglyphs, c. 1900 BC.
  • Linear A and Cretan hieroglyphs are both believed to be an example of the Minoan language. Several words have been decoded from the scripts, but no definite conclusions on the meanings of the words have been made.
• Cypro-Minoan syllabary, c. 1500 BC.
• Phaistos Disc, c. 2000 BC.
• Wadi el-Ħôl script, c. 1800 BC, likely an abjad.
• Byblos syllabary – the city of Byblos, c. 1700 BC.
• Southwest Paleohispanic script, from c. 700 BC.
• Sitovo inscription,[1][2] probably Phrygian.[3]

• Indus script, 3300 BC to 1000 BC.
• Ba–Shu scripts, 5th to 4th century BC.
• Issyk inscription, ancient Turkestan and Afghanistan.
• Khitan large script and Khitan small script – Khitan, 10th century, not fully deciphered.
• Kohi script – Gandhara, 3rd century BC to 8th century AD.
• Para-Lydian script, known from a single inscription found in Sardis Synagogue, c. 400–350 BC.[4]
• Sidetic script – Asia Minor, c. 5th to 3rd centuries BC.
• Tujia script
• Shankhalipi
• Late Harappan script
• Vikramkhol inscription

Many Mesoamerican writing systems have been discovered by archaeologists. Many of them remain undeciphered due to a lack of knowledge of the original language. These writing systems were used between 1000 BC and 1500 AD.

• Olmec – Olmec civilization, c. 900 BC, possibly the oldest Mesoamerican script.
• Isthmian, c. 500 BC, apparently logosyllabic.
• Zapotec – Zapotec, c. 500 BC.
• Mixtec – Mixtec, 14th century, perhaps pictographic. Many of the pictographic elements of the script are well-understood, but semantic and linguistic components are less well known.

• Quipu – Inca Empire, 15th century, thought by some to have been a writing system, but generally believed to be an accounting system.

• Ikom monoliths – Cross River State, sometimes believed to be an ancient precursor to Nsibidi.
• Ancient inscriptions in Somalia, According to the Ministry of Information and National Guidance of Somalia, inscriptions can be found on various old Taalo Tiiriyaad structures. These are enormous stone mounds found especially in northeastern Somalia. Among the main sites where these Taalo are located are Xabaalo Ambiyad in Alula District, Baar Madhere in Beledweyne District, and Harti Yimid in Las Anod District.[5]
• Numidian language (although the script, Libyco-Berber, has been almost fully deciphered, the language has not)

• Rongorongo – Rapa Nui (aka Easter Island), before 1860.

• Dandaleith stone
• Alekanovo inscription
• Rohonc Codex
• Singapore Stone, a fragment of a sandstone slab inscribed with an ancient Southeast Asian script, perhaps Old Javanese or Sanskrit. At least 13th century, and possibly as early as 10th to 11th century.
• Voynich manuscript, carbon dated to the 15th century.[6]
• The Newton Stone, which is considered by many scholars to be modern forgery[7]
• Some scholars consider the corpus of Pictish symbol stones to be an undeciphered writing system[8]
• So-called Hamptonese, a language used by outsider artist James Hampton in his presumably religious text.[9]

One very similar concept is that of false writing systems, which appear to be writing but are not. False writing cannot be deciphered because it has no semantic meaning. These particularly include asemic writing created for artistic purposes. One prominent example is the Codex Seraphinianus.

Another similar concept is that of undeciphered cryptograms, or cipher messages. These are not writing systems per se, but a disguised form of another text. Of course any cryptogram is intended to be undecipherable by anyone except the intended recipient so vast numbers of these exist, but a few examples have become famous and are listed in the undeciphered historical codes and ciphers category.

• Proto-Elamite (CDLI link)
• Vinča signs (The Old European Script: Further evidence - Shan M. M. Winn)