இந்திய - சைகை மொழி: உலகத்தரமும் பண்பாட்டு ஆழமும் கொண்ட இயற்கையான, முழுமையான மொழி

This research paper explores Indian Sign Language (ISL) as a linguistically complete, culturally rooted, and socially significant natural language. Used by millions of Deaf individuals across South Asia, ISL possesses all the structural grammatical components of a human language: a formal phonology, productive morphology, rule-governed syntax, and a vocabulary capable of expressing nuanced, technical concepts. This paper argues that ISL is not merely a tool for communication but a "Great Language" based on its complexity, its ability to adapt to India's diverse cultural contexts, and its growing institutional recognition. The study examines the grammatical structure of ISL, its historical origins, dialectal variations, relationships with other sign languages, and current legal and educational frameworks. While recognition under the Eighth Schedule of the Constitution is still pending, the Rights of Persons with Disabilities Act (2016) and the National Education Policy (2020) have created unprecedented opportunities for the growth of ISL. The paper concludes that ISL, as one of India's most vital linguistic treasures, deserves full official recognition.