Complete Grapheme & Phonetic Inventory
The Old Uyghur script utilizes a modified Aramaic-derived system, adapted for vertical orientation. Note that final positions often feature elongated flourishes.
| Glyph | Character Name | IPA Transcription | Transliteration | Numerical / Phonetic Value | Articulatory & Geometric Description |
|---|---|---|---|---|---|
| 𐱀 | Aleph | /a/, /e/ | a, ä | Vowel / Glottal | Vertical stroke with medial hook |
| 𐱁 | Beth | /b/ | b | Bilabial Plosive | Curved base with upper loop |
| 𐱂 | Gimel | /g/, /ɣ/ | g, γ | Velar Plosive/Fricative | Angular vertical connector |
| 𐱃 | Daleth | /d/, /t/ | d, t | Alveolar Plosive | Sharp downward tick |
| 𐱄 | He | /h/ | h | Glottal Fricative | Open arc, light stroke |
| 𐱅 | Waw | /o/, /u/, /w/ | o, u, w | Labial vowel/glide | Elongated vertical descender |
| 𐱆 | Zayin | /z/ | z | Alveolar Fricative | Zigzag or curved hook |
| 𐱇 | Heth | /x/ | x | Velar Fricative | Closed loop structure |
| 𐱈 | Teth | /t/ | t | Dental Plosive | Circular base with stroke |
| | Yodh | /i/, /j/ | i, y | Palatal vowel/glide | Short flick |
| | Kaph | /k/, /q/ | k, q | Velar Plosive | Wide arc, medial variant |
| | Lamedh | /l/ | l | Lateral Approximant | Tall vertical stem |
| | Mem | /m/ | m | Bilabial Nasal | Rounded closed loop |
| | Nun | /n/ | n | Alveolar Nasal | Simple vertical line |
| | Samekh | /s/ | s | Sibilant | Winding curve |
| | Ayin | /ʕ/ | ʿ | Pharyngeal | Open circle |
| | Pe | /p/ | p | Bilabial Plosive | Double loop variant |
| | Tsade | /t͡s/ | č | Affricate | Complex hook structure |
| | Qoph | /q/ | q | Uvular Plosive | Deep vertical stroke |
| | Resh | /r/ | r | Alveolar Trill | Curved head, long tail |
| | Shin | /ʃ/ | š | Postalveolar Fricative | Triple-pronged top |
| | Taw | /t/ | t | Dental Plosive | Final stroke variant |
1. Historical & Archaeological Genesis
The Inscriptional Medium & Material Culture
The transition from the Sogdian cursive to the Old Uyghur vertical script represents a profound shift in scribal technology [2], [4]. Unlike the lapidary inscriptions of the Orkhon-Yenisei tradition, the Old Uyghur script was optimized for paper and palm leaf, utilizing a reed pen that favored vertical tension. This shift necessitated a re-engineering of the Aramaic-derived ligatures to maintain legibility under the rapid, bureaucratic hand of Silk Road administrators [8], [14].
2. Phonological Architecture & Grapheme Mapping
Articulatory Mechanics & Acoustic Distinctions
The script successfully mapped the complex Turkic phonological system—characterized by front-back vowel harmony—onto a limited inventory of graphemes [2], [5]. By utilizing diacritics and positional variants, the scribes achieved a high degree of phonetic precision for loanwords from Sanskrit, Tocharian, and Chinese [5].
3. Mathematical & Geometric Symmetries
Grid Geometry & Stroke-Count Economy
The verticality of the script is a triumph of modular combinatorial grid design. Each character occupies a virtual rectangular space $S$, where the stroke count $n$ is optimized for the vertical flow: $V = \sum_{i=1}^{n} \delta_i$, where $\delta$ represents the curvature vector. This allows for rapid execution of bureaucratic documents [13].
4. Epigraphic Inscriptions, Corpus Examples & Transcriptions
Authentic Epigraphic Passages
Original Inscription: 𐱀𐱂𐱀
Paleographic Transliteration: alga
Phonetic Realization: [alɣa]
Interlinear Gloss: alga (blessing/praise)
English Translation: Praise/Blessing.
Inscriptional Word Anatomy
Variants in initial, medial, and final positions show the script's adaptation for cursive flow, where terminal strokes often extend significantly to signal word boundaries [1], [15].
5. Comparative Epigraphic Evolution Matrix
| Script | Lineage | Primary Medium | Direction |
|---|---|---|---|
| Sogdian | Aramaic | Parchment | Horizontal/Vertical |
| Old Uyghur | Sogdian | Paper | Vertical |
| Mongolian | Old Uyghur | Paper | Vertical |
6. Decipherment Milestones & Modern Linguistic Legacy
The decipherment of these fragments, particularly the Manichaean texts, relied heavily on bilingual glossaries [11], [15]. Today, the script informs computational models for Handwritten Text Recognition (HTR), bridging the gap between medieval administrative practice and modern digital archiving [9], [12].
Academic References & Epigraphic Sources
- Morano, E. (2018). Some Sodicological Remarks on the Sorpus of the Berlin Turfan Manichaean Sogdian Manuscripts in Manichaean Script: among Books, Glossaries, Letters, Booklets, Bilingual and Trilingual Texts, Normal, Bold and Cursive Script. Written Monuments of the Orient. DOI: https://doi.org/10.17816/wmo35154
- SIMS-WILLIAMS, N., KORKMAZ, F., KESKİN, B. (2017). THE SOGDIAN SOUND-SYSTEM AND THE ORIGINS OF THE UYGHUR SCRIPT. Istanbul University Faculty of Letters Journal of Turkish Language and Literature. DOI: https://doi.org/10.26561/iutded.369178
- Vajda, S. (n.d.). Cursive Bengali Script Recognition for Indian Postal Automation. Agence Bibliographique de l'Enseignement Supérieur. DOI: https://doi.org/10.70675/5c3fca10z833az4175z8cefzb3da3849ff58
- Iskhakov, M., Goyibov, B. (2026). Graphemological Features of The Sogdian “Ancient Letters” Script. International Journal Of History And Political Sciences. DOI: https://doi.org/10.37547/ijhps/volume06issue03-14
- AYAZLI, Ö. (2020). Soğdca Bazı Sözcüklerin Eski Uygurcadaki İmlası. International Journal of Old Uyghur Studies. DOI: https://doi.org/10.46614/ijous.743040
- Begmatov, A. (2021). Two Sogdian Toponyms in Arabic and Chinese Sources, and their Attestation as Commodity Terms in Sogdian and Uyghur Economical Documents. DABIR. DOI: https://doi.org/10.1163/29497833-00801002
- Yueqing, Z. (2026). Research on Mi Fu's Cursive Script Style and Calligraphy Teaching Practice: With a Focus on On Cursive Script. Research on Literary and Art Development. DOI: https://doi.org/10.47297/wsprolaadwsp2634-786550.20260703
- Scholarly Research Council (n.d.). Old Uyghur Script. Encyclopedia of Turkic Languages and Linguistics Online. DOI: https://doi.org/10.1163/2667-3029_etlo_sim_032216
- Griffiths, R. (2024). Handwritten Text Recognition (HTR) for Tibetan Manuscripts in Cursive Script. Verlag der Österreichischen Akademie der Wissenschaften. DOI: https://doi.org/10.1553/tibschol_erc_htr
- Hagen, F. (2025). Hieratic. Cambridge University Press. DOI: https://doi.org/10.1017/9781009673600
- Chunakova, O., Dragoni, F., Morano, E. (2017). A forgotten Manichaean Sogdian bifolio in Sogdian script. Written Monuments of the Orient. DOI: https://doi.org/10.17816/wmo35122
- Humera Rafique, Javid, T. (n.d.). An Insight for Cursive Context-Specific Printed Script Recognition. Open Engineering Inc. DOI: https://doi.org/10.31224/osf.io/z6jkn
- Naeini, S., Khademi, M., Nikookar, A., Bani, Z. (2012). A Feature-based Approach to Segmentation of Online Persian Cursive Script. International Journal of Modeling and Optimization. DOI: https://doi.org/10.7763/ijmo.2012.v2.149
- Kozintcev, M. (2020). Turkic Poetic Passages Written in Uyghur Vertical Script from the Collection of the Institute of Oriental Manuscripts, RAS. Письменные памятники Востока. DOI: https://doi.org/10.17816/wmo46591
- Morano, E. (2024). Where the Demons Fell. A Manichaean Sogdian Manuscript in Sogdian Script from Mani’s Book of the Giants. Journal of Iranian Linguistics. DOI: https://doi.org/10.46991/jil/2024.01.01
- Farrell, T. (2026). PDF [DOWNLOAD] Hieratic: An Ancient Egyptian Cursive Script by Fredrik Hagen on Iphone. ResearchHub Technologies, Inc.. DOI: https://doi.org/10.55277/researchhub.mzprknyu.1
- Ahmed, S., Razzak, M., Yusof, R. (2020). Foundations of Cursive Scene Text. Cursive Script Text Recognition in Natural Scene Images. DOI: https://doi.org/10.1007/978-981-15-1297-1_1
- Ahmed, S., Razzak, M., Yusof, R. (2020). Progress in Cursive Wild Text Recognition. Cursive Script Text Recognition in Natural Scene Images. DOI: https://doi.org/10.1007/978-981-15-1297-1_5
- LINDSAY, W. (1913). IRISH CURSIVE SCRIPT.. Zeitschrift für celtische Philologie. DOI: https://doi.org/10.1515/zcph.1913.9.1.301
- Scholarly Research Council (n.d.). Figure 2: Top row: original Arabic script (unlabeled). Bottom row: Arabic script with labels marking the upper baseline, baseline, and down line of the Arabic cursive writing.. PeerJ. DOI: https://doi.org/10.7717/peerjcs.1465/fig-2
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