Type of Scripts in Ancient India
Scripts                                           Detail
  Indus Script           By IVC People
                         Not Decipher Yet
                         right to left in one line & then left to right in the next line.
 Brahmi Script           Left to right
                         Most used by Ashoka in his inscriptions
                         It was deciphered in 1937 by James Princep.
                         Originator of most of the present Indian scripts, including
                          Devanagari, Bengali, Tamil, and Malayalam etc
  Gupta Script           Left To Right
                         Used to write Sanskrit in Gupta Period
                         The Nagari, Sharada, and Siddham scripts all descended
                          from the Gupta script, which descended from Brahmi.
Kharosthi Script         From Right to left
                         It is the sister script and contemporary of Brahmi. It was
                          written from right to left.
                         It was used in the Gandhara culture of North-Western India
                          and is sometimes also called the Gandhari Script.
                         Its inscriptions have been found in the form of Buddhist Texts
                          from present clay Afghanistan and Pakistan.
Vatteluttu Script        Left to right
                         It was a script derived from the Brahmi and was used in the
                          Southern part of India.
                         It was used to write Tamil and Malayalam.
Kadamba Script           It, too, is a descendant of the Brahmi script (Meaning L To
                          R) and was developed during the reign of the Kadamba
                          dynasty in the 4th-6th centuries.
                     This script was later adapted into Kannada-Telegu script.
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 Grantha Script          Between the sixth and twentieth centuries, Tamil speakers in
                          South India, particularly in Tamil Nadu and Kerala, used the
                          Grantha script to write Sanskrit and the classical
                          language Manipravalam.
                         It is still used in traditional Vedic schools.
                         It is a Brahmic script that evolved from the Tamil Nadu
                          Brahmi script.
                         The Malayalam script, like the Tigalari and Sinhala alphabets,
                          is a direct descendant of Grantha.
  Sarada Script          Belong to Brahmic family of scripts that emerged around
                          the eighth century.
                         It was employed in the writing of Sanskrit and Kashmiri.
                         Its use was once more widespread, but it was later restricted to
                          Kashmir, and it is now rarely used except by the Kashmiri
                          Pandit community for religious purposes.
                        
Gurmukhi Script          Evolved from the Sarada script and was standardised
                          by Guru Angad in the 16th century.
                         This script is used to write the entire Guru Granth Sahib and is
                          the script most commonly used by Sikhs and Hindus to write
                          Punjabi.
Devanagari Script        Used in India and Nepal.
                         It's written from left to right.
                         Used for over 120 languages and dialects, including Hindi,
                          Marathi, Nepali, Pali, Konkani, Bodo, Sindhi, and Maithili,
                          making it one of the most widely used and adopted writing
                          systems in the world.
                         Classical Sanskrit texts are also written in Devanagari.
  Modi Script            Modi is a script that is used to write Marathi.
                         Modi was the official Marathi script until the twentieth
                          century, when the Balbodh style of the Devanagari script was
                          promoted as the standard Marathi writing system.
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    Urdu Script             Right-to-left alphabet.
  Kalinga Script            Kalinga was the ancient name of Odisha and this script was
                             used to write an ancient form of Oriya.
                            It is visually close to the original Brahmi. (so left to right)
                            Oriya language presently uses a different script, which has
                             been derived from Bengali script.
   Nagari Script            It was an Eastern variant of the Gupta script. It is an early
                             form of the Devanagari script.
                            It branched off into many other scripts such as Devanagari,
                             Bengali, and Tibetan etc. It was used to write both Prakrit and
                             Sanskrit.
   Nandinagari              Derived from the Nagari script which appeared in the 7th
                             century AD. (So Left to right since Gupta Script is related to
                             Brahmi Script)
                            This script and its variants were used in the central Deccan
                             region and south India,
Note: if it is Brahmi Script or somehow related to Brahmai Script than its Writing direction will be
Left to Right.
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