Sign Languages Around the World: Not One Universal Language

Sign languages are complete, natural languages with their own grammar, syntax, and vocabulary — they are not visual versions of spoken languages. There are over 300 distinct sign languages used around the world, and they are as different from each other as spoken languages are.

Introduction

One of the most persistent myths about sign languages is that they are universal. In fact, American Sign Language (ASL) is unintelligible to British Sign Language (BSL) users, despite both countries speaking English. This is because sign languages evolve independently within deaf communities, shaped by the same geographic and historical forces that shape spoken languages.

Major Sign Languages

• ASL (American Sign Language): ~500,000 - 2 million users in the US/Canada
• BSL (British Sign Language): ~77,000 users in the UK
• LSF (French Sign Language): ~100,000 users in France
• JSL (Japanese Sign Language): ~320,000 users in Japan
• CSL (Chinese Sign Language): ~20 million users in China

American Sign Language (ASL) is one of the most widely studied sign languages. It descended from French Sign Language (LSF), brought to the United States in 1817 by Laurent Clerc and Thomas Hopkins Gallaudet. Because of this history, ASL is more closely related to French Sign Language than to British Sign Language, despite the US and UK sharing English.

Chinese Sign Language (CSL) has the largest user population, reflecting China's large deaf community. Like spoken Chinese, CSL has regional variations, with Northern and Southern varieties being significantly different. Indian Sign Language (ISL), used by an estimated 1.8 million people, is one of the most linguistically diverse sign language communities.

Sign Language Families

• French SL Family: ASL, LSF, Irish SL, Brazilian SL, and many more
• British SL Family: BSL, Auslan (Australian), NZSL (New Zealand)
• Japanese SL Family: JSL, Korean SL, Taiwanese SL
• Arab SL Family: Multiple varieties across the Middle East

Like spoken languages, sign languages form families. The French Sign Language family is the largest, including ASL, Irish Sign Language, Brazilian Sign Language, and dozens of others spread by deaf education networks in the 19th and 20th centuries.

The British Sign Language family includes BSL, Australian Sign Language (Auslan), and New Zealand Sign Language (NZSL). These are mutually intelligible to a high degree because Australia and New Zealand's deaf communities were established by British deaf emigrants. American and British sign languages, however, are completely different.

Linguistic Structure

• 3D Grammar: Uses space for grammatical relationships
• Simultaneity: Multiple information channels at once (hands, face, body)
• Classifier Systems: Handshapes represent categories of objects
• Non-Manual Markers: Facial expressions function as grammar

Sign languages exploit the visual-spatial modality in ways that spoken languages cannot. Signers establish referents at points in the signing space, then direct verbs between these points to show who did what to whom. This spatial grammar has no equivalent in spoken language and is far more complex than simple gesturing.

Facial expressions in sign languages are not merely emotional — they function as grammatical markers. In ASL, raised eyebrows mark yes/no questions, furrowed eyebrows mark wh-questions, and specific mouth shapes modify the meaning of signs. A sign produced with different facial expressions can mean completely different things.

History & Recognition

• Milan Conference (1880): Banned sign language in deaf education for nearly a century
• Stokoe (1960): First linguist to prove ASL is a true language
• UN Convention: 2006 — recognized sign languages as full languages
• Legal Recognition: Growing worldwide, but uneven

The history of sign language is marked by oppression. The 1880 Milan Conference of deaf educators voted to ban sign language from schools, favoring oral methods (lip-reading and speech). For nearly a century, deaf children in many countries were punished for signing, causing immense harm to deaf education and culture.

William Stokoe's 1960 research at Gallaudet University demonstrated that ASL has all the structural properties of a natural language. This was revolutionary — until then, sign languages were widely dismissed as pantomime. Today, over 40 countries legally recognize their national sign languages, though many still do not.

Endangered Sign Languages

• Village Sign Languages: Small community sign languages at risk
• Al-Sayyid Bedouin SL: ~150 users in Israel's Negev desert
• Kata Kolok: ~50 deaf signers in a Bali village
• Providence Island SL: Nearly extinct Caribbean sign language

Just as spoken languages can be endangered, so can sign languages. Small community sign languages — developed in villages with high rates of hereditary deafness — are particularly vulnerable. When deaf education changes or community structures shift, these unique languages can disappear within a generation.

Al-Sayyid Bedouin Sign Language, used in a Bedouin community in Israel's Negev desert, is one of the most studied village sign languages. It emerged spontaneously about 75 years ago when hereditary deafness became common in the community. Both deaf and hearing members use the language, providing linguists with a rare window into how new languages emerge.

Key Facts

• There are over 300 distinct sign languages worldwide — there is no universal sign language.
• ASL is more closely related to French Sign Language than to British Sign Language.
• Sign languages have full grammar, including spatial syntax and facial expression markers.
• The 1880 Milan Conference banned sign language in schools for nearly a century.
• Chinese Sign Language has the largest user population of any sign language.

Fun Facts

• Deaf children of hearing parents often invent their own gestural systems called "homesign," demonstrating the innate human drive to create language.
• Nicaraguan Sign Language emerged spontaneously in the 1980s when deaf children were brought together in schools for the first time — they created a new language from scratch.
• ASL poetry and storytelling are recognized art forms, with deaf performers competing at festivals worldwide.
• Martha's Vineyard, Massachusetts, had such a high rate of hereditary deafness that both deaf and hearing residents used sign language from the 17th to early 20th century.

Final Thoughts

Sign languages shatter the assumption that language must be spoken. With over 300 distinct visual languages around the world, each with full grammar, rich vocabulary, and cultural heritage, sign languages demonstrate that the human capacity for language transcends any single modality. Their diversity, history, and ongoing fight for recognition make them one of the most fascinating areas of linguistic study.