Old Bangkok Sign Language
Old Bangkok Sign Language is a sign language spoken in Thailand. Glottolog rates it nearly extinct.
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Sign languages are full natural languages with their own grammar, unrelated to the spoken languages around them.
Bangkok Sign Language (also known as Old or Original Bangkok Sign Language; Thai: ภาษามือกรุงเทพเก่า, romanized: P̣hās̄ʹā mụ̄x krungtheph kèā) is a deaf-community sign language of Thailand that arose among deaf people who migrated to Bangkok for work or family.
The language is moribund, with all speakers born before 1960. Younger generations have switched to Thai Sign Language, which seems to have arisen as a mixture of Old Bangkok SL and American Sign Language.
From Wikipedia · Old Bangkok Sign Language · CC BY-SA 4.0