Bangkok Sign Language (also known as Old or Original Bangkok Sign Language) is a

deaf-community sign language A deaf-community or urban sign language is a sign language that emerges when deaf people who do not have a common language come together and form a community. This may be a formal situation, such as the establishment of a school for deaf students, ...

of Thailand that arose among deaf people who migrated to

Bangkok Bangkok, officially known in Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies in the Chao Phraya River delta in central Thailand and has an estimated populati ...

for work or family. The language is moribund, with all speakers born before 1960. Younger generations have switched to

Thai Sign Language Thai Sign Language (TSL), or Modern Standard Thai Sign Language (MSTSL), is the national sign language of Thailand's deaf community and is used in most parts of the country by the 20 percent of the estimated 56,000 pre-linguistically deaf people ...

, which seems to have arisen as a mixture of Old Bangkok SL and American Sign Language.

References

*James Woodward, "Sign Languages and Deaf Identities in Thailand and Vietnam". In Monaghan ''et al.'' eds, ''Many Ways to Be Deaf: International Variation in Deaf Communities'', 2003 Thailand Sign Language family Endangered sign languages