Original Costa Rican Sign Language
Original Costa Rican Sign Language is a sign language spoken in Costa Rica. 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.
Old Costa Rican Sign Language is a deaf-community sign language of San Jose, spoken by people born before about 1945. Along with American Sign Language, it is one of the sources of New Costa Rican Sign Language.
From Wikipedia · Old Costa Rican Sign Language · CC BY-SA 4.0