By 1977 at least 2,906 inscribed objects with legible inscriptions had been discovered, and by 1992 a total of approx. 4,000 inscribed objects had been found. In 2025, it was reported around 5,000 inscriptions have been excavated since 1924.
Early examples of the Indus script have been found on pottery inscriptions and clay impressions of inscribed Harappan seals dating to around c. 2800–2600 BCE during the Early Harappan period, and emerging alongside administrative objects such as seals and standardised weights during the Kot Diji phase of this period. However, excavations at Harappa have demonstrated the development of some symbols from potter's marks and graffiti belonging to the earlier Ravi phase from c. 3500–2800 BCE.
Numerous artefacts, particularly potsherds and tools, bearing markings inscribed into them have been found in Central India, South India, and Sri Lanka dating to the Megalithic Iron Age which followed the Late Harappan period. These markings include inscriptions in the Brahmi and Tamil-Brahmi scripts, but also include non-Brahmi graffiti symbols which co-existed contemporaneously with the Tamil-Brahmi script. As with the Indus script, there is no scholarly consensus on the meaning of these non-Brahmi symbols. Some scholars, such as the anthropologist Gregory Possehl, have argued that the non-Brahmi graffiti symbols are a survival and development of the Indus script into and during the 1st millennium BCE. In 1960, archaeologist B. B. Lal found that a majority of the megalithic symbols he had surveyed were identifiably shared with the Indus script, concluding that there was a commonness of culture between the Indus Valley Civilisation and the later Megalithic period. Similarly, Indian epigraphist Iravatham Mahadevan has argued that sequences of Megalithic graffiti symbols have been found in the same order as those on comparable Harappan inscriptions and that this is evidence that language used by the Iron Age people of south India was related to or identical with that of the late Harappans.
The number of principal signs is over 400, which is considered too large a number for each character to be a phonogram, and so the script is generally believed to be logo-syllabic. The precise total number of signs is uncertain, as there is disagreement concerning whether particular signs are distinct or variants of the same sign. In the 1970s, the Indian epigrapher Iravatham Mahadevan published a corpus and concordance of Indus inscriptions listing 419 distinct signs in specific patterns. However, in 2015, the archaeologist and epigrapher Bryan Wells estimated that were around 694 distinct signs.
Some researchers have sought to establish a relationship between the Indus script and Brahmi, arguing that it is a substratum or ancestor to later writing systems used in the region of the Indian subcontinent. Others have compared the Indus script to roughly contemporary pictographic scripts from Mesopotamia and the Iranian plateau, particularly Sumerian proto-cuneiform and Elamite scripts. However, researchers now generally agree that the Indus script is not closely related to any other writing systems of the second and third millennia BCE, although some convergence or diffusion with Proto-Elamite conceivably may be found. A new study has also noticed a relationship with scripts across the Tibetian-Yi corridor. A definite relationship between the Indus script and any other script remains unproven.
The following factors are usually regarded as the biggest obstacles to successful decipherment:
Over the years, numerous decipherments have been proposed, but there is no established scholarly consensus. The few points on which there exists scholarly consensus are the right-to-left direction of the majority of the inscriptions, numerical nature of certain stroke-like signs, functional homogeneity of certain terminal signs, and some generally adopted techniques of segmenting the inscriptions into initial, medial, and terminal clusters. Over 100 (mutually exclusive) attempts at decipherment have been published since the 1920s, and the topic is popular among amateur researchers.
Although no clear consensus has been established, there are those who argue that the Indus script recorded an early form of the Dravidian languages (Proto-Dravidian). Early proponents included the archaeologist Henry Heras, who suggested several readings of signs based on a proto-Dravidian assumption.
These scholars have proposed readings of many signs; one such reading was legitimised when the Dravidian homophonous words for 'fish' and 'star', mīn, were hinted at through drawings of both the things together on Harappan seals.[better source needed] In a 2011 speech, Rajesh P. N. Rao said that Iravatham Mahadevan and Asko Parpola "have been making some headway on this particular problem", namely deciphering the Indus script, but concluded that their proposed readings, although they make sense, are not yet proof.
Perhaps the most influential proponent of the hypothesis that the Indus script records an early Indo-Aryan language is the Indian archaeologist Shikaripura Ranganatha Rao, who in his books, Lothal and the Indus Civilization (1973) and The Decipherment of the Indus Script, wrote that he had deciphered the script. While dismissing most such attempts at decipherment, John E. Mitchiner commented that "a more soundly-based but still greatly subjective and unconvincing attempt to discern an Indo-European basis in the script has been that of Rao". S. R. Rao perceived a number of similarities in shape and form between the late Harappan characters and the Phoenician letters, and argued that the Phoenician script evolved from the Harappan script, and not, as the classical theory suggests from the Proto-Sinaitic script.[89] He compared it to the Phoenician alphabet, and assigned sound values based on this comparison. Reading the script from left to right, as is the case with Brahmi, he concluded that Indus inscriptions included numerals and were "Sanskritic". Consistent with this proposed Sanskritic connection, Suzanne Redalia Sullivan has provided a near complete solution and interpretation of the Indus Valley Script.
An opposing hypothesis is that these symbols are nonlinguistic signs which symbolise families, clans, gods, and religious concepts, and are similar to components of coats of arms or totem poles. In a 2004 article, Steve Farmer, Richard Sproat, and Michael Witzel presented a number of arguments stating that the Indus script is nonlinguistic. The main ones are the extreme brevity of the inscriptions, the existence of too many rare signs (which increase over the 700-year period of the Mature Harappan civilisation), and the lack of the random-looking sign repetition that is typical of language.
Locklear, Mallory (25 January 2017). "Science: Machine learning could finally crack the 4,000-year-old Indus script". The Verge. Manhattan, New York, NY: Vox Media. Retrieved 25 January 2017. After a century of failing to crack an ancient script, linguists turn to machines. https://www.theverge.com/2017/1/25/14371450/indus-valley-civilization-ancient-seals-symbols-language-algorithms-ai
Possehl (1996). - Possehl, Gregory L. (1996). Indus Age: The Writing System. University of Pennsylvania Press. ISBN 978-0-8122-3345-2.
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Locklear, Mallory (25 January 2017). "Science: Machine learning could finally crack the 4,000-year-old Indus script". The Verge. Manhattan, New York, NY: Vox Media. Retrieved 25 January 2017. After a century of failing to crack an ancient script, linguists turn to machines. https://www.theverge.com/2017/1/25/14371450/indus-valley-civilization-ancient-seals-symbols-language-algorithms-ai
Wright (2009), p. 7. - Wright, Rita P. (2009). The Ancient Indus: Urbanism, Economy, and Society. Cambridge University Press. ISBN 978-0-521-57219-4.
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Hunter (1934). - Hunter, G. R. (1934). The Script of Harappa and Mohenjodaro and Its Connection with Other Scripts. Studies in the history of culture. London: K. Paul, Trench, Tubner. OCLC 02042562. http://ufdc.ufl.edu/AA00013642/
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Rahman, Tariq. "Peoples and languages in pre-Islamic Indus valley". Archived from the original on 9 May 2008. Retrieved 20 November 2008. most scholars have taken the 'Dravidian hypothesis' seriously https://web.archive.org/web/20080509053921/http://asnic.utexas.edu/asnic/subject/peoplesandlanguages.html
"The Indus Script | Harappa". harappa.com. Retrieved 22 May 2020. https://www.harappa.com/script/maha0.html
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Fairservis (1992), p. 5. - Fairservis, Walter Ashlin (1992). The Harappan Civilization and Its Writing: A Model for the Decipherment of the Indus Script. Brill. ISBN 978-8120404915. https://books.google.com/books?id=ckmzIlTQBh4C
Pragati, K. B. (1 February 2025). "Want a Million Dollars? Get Busy Deciphering This Ancient Script". The New York Times. Retrieved 2 February 2025. https://www.nytimes.com/2025/02/01/world/asia/india-indus-script-prize.html
Possehl (2002), p. 127. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Fairservis (1983). - Fairservis, Walter Ashlin (1983). "The Script of the Indus Valley Civilization". Scientific American. 248 (3): 58–67. Bibcode:1983SciAm.248c..58F. doi:10.1038/scientificamerican0383-58. JSTOR 24968852. https://ui.adsabs.harvard.edu/abs/1983SciAm.248c..58F
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Kenoyer (2006), pp. 10–11. - Kenoyer, J M (2006). "The Origin, Context and Function of the Indus Script: Recent Insights from Harappa" (PDF). In Osada, Toshiki (ed.). Proceedings of the Pre-symposium and the 7th ESCA Harvard–Kyoto Roundtable. Kyoto: Research Institute for Humanity and Nature. pp. 9–27. Retrieved 25 June 2022. https://www.harappa.com/sites/default/files/pdf/Kenoyer2006_The%20Origin%2C%20Context%20and%20Function%20of%20the%20Indus%20Sc.pdf
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Kenoyer (2006), pp. 10–11. - Kenoyer, J M (2006). "The Origin, Context and Function of the Indus Script: Recent Insights from Harappa" (PDF). In Osada, Toshiki (ed.). Proceedings of the Pre-symposium and the 7th ESCA Harvard–Kyoto Roundtable. Kyoto: Research Institute for Humanity and Nature. pp. 9–27. Retrieved 25 June 2022. https://www.harappa.com/sites/default/files/pdf/Kenoyer2006_The%20Origin%2C%20Context%20and%20Function%20of%20the%20Indus%20Sc.pdf
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Meadow & Kenoyer (2010), p. xlviii. - Meadow, Richard H.; Kenoyer, Jonathan Mark (2010). "Inscribed Objects from Harappa Excavations 1986–2007" (PDF). In Parpola, Asko; Pande, B. M.; Koskikallio, Petteri (eds.). Volume 3: New material, untraced objects, and collections outside India and Pakistan, Part 1: Mohenjo-daro and Harappa. Corpus of Indus Seals and Inscriptions. Memoirs of the Archaeological Survey of India, no. 96. Helsinki: Suomalainen Tiedeakatemia. pp. xliv–lviii. Archived from the original (PDF) on 30 June 2011. https://web.archive.org/web/20110630045110/http://www.harappa.com/indus/Kenoyer-Meadow-2010-HARP.pdf
1540 from Mohenjodaro, 985 from Harappa, 66 from Chanhudaro /wiki/Chanhudaro
165 from Lothal, 99 from Kalibangan, 7 from Banawali, 6 from Ur in Iraq, 5 from Surkotada, 4 from Chandigarh /wiki/Lothal
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The commonly depicted "unicorn" is most likely a bull drawn in profile as to obscure one horn behind the other.[29]
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Possehl (1996). - Possehl, Gregory L. (1996). Indus Age: The Writing System. University of Pennsylvania Press. ISBN 978-0-8122-3345-2.
Ray (2006), p. 21-22. - Ray, Himanshu Prabha (2006). "Inscribed pots, emerging identities". In Olivelle, Patrick (ed.). Between the Empires: Society in India 300 BCE to 400 CE. Oxford University Press. pp. 113–139.
Lal (1960). - Lal, Braj Basi (1960). "From the Megalithic to the Harappan: Tracing Back the Graffiti on the Pottery". Ancient India. 16: 4–24.
47 out of 61 signs surveyed.
Ray (2006), pp. 21–22. - Ray, Himanshu Prabha (2006). "Inscribed pots, emerging identities". In Olivelle, Patrick (ed.). Between the Empires: Society in India 300 BCE to 400 CE. Oxford University Press. pp. 113–139.
Mahadevan (2001a). - Mahadevan, Iravatham (2001a). "The Indus-like symbols on megalithic pottery: New evidence". Studia Orientalia Electronica. 94: 379–386.
Mahadevan (2004). - Mahadevan, Iravatham (2004). "Megalithic pottery inscription and a Harappa tablet:A case of extraordinary resemblance" (PDF). Harappa. Archived from the original (PDF) on 1 November 2012. https://web.archive.org/web/20121101092716/http://www.harappa.com/arrow/sulur-megalithic.pdf
Mahadevan (2006). - Mahadevan, Iravatham (2006). "A Note on the Muruku Sign of the Indus Script in light of the Mayiladuthurai Stone Axe Discovery". Harappa.com. https://www.harappa.com/content/arrow/stone_celt_indus_signs.html
Fairservis (1992), pp. 9–10. - Fairservis, Walter Ashlin (1992). The Harappan Civilization and Its Writing: A Model for the Decipherment of the Indus Script. Brill. ISBN 978-8120404915. https://books.google.com/books?id=ckmzIlTQBh4C
Fairservis (1992), pp. 9–10. - Fairservis, Walter Ashlin (1992). The Harappan Civilization and Its Writing: A Model for the Decipherment of the Indus Script. Brill. ISBN 978-8120404915. https://books.google.com/books?id=ckmzIlTQBh4C
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Mukhopadhyay (2019), p. 2. - Mukhopadhyay, Bahata Ansumali (2019). "Interrogating Indus inscriptions to unravel their mechanisms of meaning conveyance". Palgrave Communications. 5 (1): 1–37. doi:10.1057/s41599-019-0274-1. ISSN 2055-1045. https://doi.org/10.1057%2Fs41599-019-0274-1
Wells (2015), pp. 66–76. - Wells, B. K. (2015). The Archaeology and Epigraphy of Indus Writing. Oxford, UK: Archaeopress. ISBN 9781784910464.
Stiebing & Helft (2018), pp. 104–105. - Stiebing, William H. Jr.; Helft, Susan N. (2018). Ancient Near Eastern History and Culture (3rd ed.). Routledge. ISBN 978-1-134-88083-6. https://books.google.com/books?id=C4U0DwAAQBAJ
Possehl (2002), p. 132. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Robinson (2015). - Robinson, Andrew (2015). "Ancient civilization: Cracking the Indus script". Nature News. 526 (7574): 499–501. Bibcode:2015Natur.526..499R. doi:10.1038/526499a. PMID 26490603. https://doi.org/10.1038%2F526499a
Possehl (2002), p. 132. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Robinson (2015). - Robinson, Andrew (2015). "Ancient civilization: Cracking the Indus script". Nature News. 526 (7574): 499–501. Bibcode:2015Natur.526..499R. doi:10.1038/526499a. PMID 26490603. https://doi.org/10.1038%2F526499a
Mahadevan (1977), pp. 14–15, 24–25, 32–35. - Mahadevan, Iravatham (1977). The Indus Script: Text, Concordance and Tables. New Delhi: Archaeological Survey of India. https://archive.org/details/masi77indusscripttextsconcordancestablesiravathammahadevanalt_443_h
Mahadevan's 1977 sign list originally included 417 signs but in a late addendum to the list, he added 2 additional signs, identified in then recently discovered inscriptions, which he had not been able to include in the sign list before publishing.
Wells (2015), p. 13. - Wells, B. K. (2015). The Archaeology and Epigraphy of Indus Writing. Oxford, UK: Archaeopress. ISBN 9781784910464.
Possehl (2002), p. 132. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Possehl (2002), p. 133. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Possehl (2002), p. 133. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
"Corpus by Asko Parpola". Mohenjodaro. Archived from the original on 1 November 2020. https://web.archive.org/web/20201101112146/http://mohenjodaroonline.net/index.php/indus-script/corpus-by-asko-parpola
Mahadevan (1977), pp. 10–14. - Mahadevan, Iravatham (1977). The Indus Script: Text, Concordance and Tables. New Delhi: Archaeological Survey of India. https://archive.org/details/masi77indusscripttextsconcordancestablesiravathammahadevanalt_443_h
Mukhopadhyay (2019), p. 2. - Mukhopadhyay, Bahata Ansumali (2019). "Interrogating Indus inscriptions to unravel their mechanisms of meaning conveyance". Palgrave Communications. 5 (1): 1–37. doi:10.1057/s41599-019-0274-1. ISSN 2055-1045. https://doi.org/10.1057%2Fs41599-019-0274-1
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Possehl (2002), p. 134. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Mahadevan (1977), pp. 10–14. - Mahadevan, Iravatham (1977). The Indus Script: Text, Concordance and Tables. New Delhi: Archaeological Survey of India. https://archive.org/details/masi77indusscripttextsconcordancestablesiravathammahadevanalt_443_h
Possehl (1996), p. 59–62. - Possehl, Gregory L. (1996). Indus Age: The Writing System. University of Pennsylvania Press. ISBN 978-0-8122-3345-2.
Possehl (2002), p. 134. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Possehl (2002), p. 131, 133, fig. 7.5. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
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Ooha Lakkadi Reddy (2025). "Rerouting Connection: Hybrid Computer Vision Analysis Reveals Visual Similarity Between Indus and Tibetan-Yi Corridor Writing Systems". arXiv:2503.21074 [cs.CV]. /wiki/ArXiv_(identifier)
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Hunter (1934). - Hunter, G. R. (1934). The Script of Harappa and Mohenjodaro and Its Connection with Other Scripts. Studies in the history of culture. London: K. Paul, Trench, Tubner. OCLC 02042562. http://ufdc.ufl.edu/AA00013642/
Possehl (2002), p. 131. - Possehl, Gregory L. (2002). The Indus Civilization: A Contemporary Perspective. Rowman Altamira. ISBN 978-0-7591-1642-9.
Zvelebil (1990), pp. 85–86, 96. - Zvelebil, Kamil (1990). Dravidian Linguistics: An introduction. Pondicherry: Pondicherry Institute of Linguistics and Culture. ISBN 81-85452-01-6. OCLC 24332848. https://archive.org/details/zvelebildravidianlinguisticsanintroduction1990/
Hunter (1932), p. 483. - Hunter, G. R. (1932). "Mohenjo-daro—Indus Epigraphy". Journal of the Royal Asiatic Society of Great Britain & Ireland. 64 (2): 466–503. doi:10.1017/S0035869X00112444. S2CID 163294522. https://www.cambridge.org/core/product/identifier/S0035869X00112444/type/journal_article
Mahadevan (1977), p. 9. - Mahadevan, Iravatham (1977). The Indus Script: Text, Concordance and Tables. New Delhi: Archaeological Survey of India. https://archive.org/details/masi77indusscripttextsconcordancestablesiravathammahadevanalt_443_h
Shinde & Willis (2014). - Shinde, Vasant; Willis, Rick J. (2014). "A New Type of Inscribed Copper Plate from Indus Valley (Harappan) Civilisation". Ancient Asia. 5. doi:10.5334/aa.12317. https://doi.org/10.5334%2Faa.12317
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Biswas, Soutik (16 January 2025). "Indus Valley: A million-dollar challenge to crack the script of early Indians". BBC Home. Retrieved 17 January 2025. https://www.bbc.com/news/articles/c70q44zn18wo
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Witzel (1999) underlines the prefixing nature of these words and calls them Para-Munda, a language related to but not belonging to Proto-Munda. - Witzel, M. (1999). "Substrate Languages in Old Indo-Aryan (Ṛgvedic, Middle, and Late Vedic)". Electronic Journal of Vedic Studies. 5 (1): 1–67. doi:10.11588/ejvs.1999.1.828. ISSN 1084-7561. https://hasp.ub.uni-heidelberg.de/journals/ejvs/article/view/828
Robinson (2015). - Robinson, Andrew (2015). "Ancient civilization: Cracking the Indus script". Nature News. 526 (7574): 499–501. Bibcode:2015Natur.526..499R. doi:10.1038/526499a. PMID 26490603. https://doi.org/10.1038%2F526499a
Robinson (2015). - Robinson, Andrew (2015). "Ancient civilization: Cracking the Indus script". Nature News. 526 (7574): 499–501. Bibcode:2015Natur.526..499R. doi:10.1038/526499a. PMID 26490603. https://doi.org/10.1038%2F526499a
(..)ibra, a partial name of a king of Meluhha, a place associated with the Indus Civilisation, is briefly attested in an Akkadian inscription, but no full names are attested. /wiki/(..)ibra
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For example, see Egbert Richter and N. S. Rajaram. /wiki/Egbert_Richter-Ushanas
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With reference to Rao (1973), chapter 10. - Rao, Shikaripur Ranganath (1973). Lothal and the Indus Civilisation. Bombay: Asia Publishing House.
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Given as aeka, dwi, tra, chatus, panta, happta/sapta, dasa, dvadasa, shata (1, 2, 3, 4, 5, 7, 10, 12, 100)
Sreedharan (2007), p. 268–269. - Sreedharan, E. (2007). A Manual of Historical Research Methodology. Kerala: Centre for South Indian Studies. ISBN 9788190592802. https://books.google.com/books?id=TG6PXBKwXNMC
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"Indus Script". ancientscripts.com. Archived from the original on 19 December 2016. https://web.archive.org/web/20161219204914/https://www.ancientscripts.com/indus.html
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Computational Linguistics, Volume 36, Issue 4, December 2010. http://www.mitpressjournals.org/toc/coli/36/4
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"SEI List of Scripts Not Yet Encoded". linguistics.berkeley.edu/sei/. https://linguistics.berkeley.edu/sei/scripts-not-encoded.html
"Proposed New Scripts". unicode.org. http://unicode.org/pending/pending.html
"A Free Complete Indus Font Package Available". harappa.com. Archived from the original on 5 May 2017. https://web.archive.org/web/20170505180620/https://www.harappa.com/blog/free-complete-indus-font-package-available
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"Corpus by Asko Parpola". Mohenjodaro. Archived from the original on 1 November 2020. https://web.archive.org/web/20201101112146/http://mohenjodaroonline.net/index.php/indus-script/corpus-by-asko-parpola
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