Old Costa Rican 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 San Jose, spoken by people born before about 1945. Along with

American Sign Language American Sign Language (ASL) is a natural language that serves as the predominant sign language of Deaf communities in the United States of America and most of Anglophone Canada. ASL is a complete and organized visual language that is express ...

, it is one of the sources of

New Costa Rican Sign Language American Sign Language (ASL) developed in the United States and Canada, but has spread around the world. Local varieties have developed in many countries, but there is little research on which should be considered dialects of ASL (such as Bolivia ...

. (Woodward 1991, 1992)

References

{{reflist * James Woodward, 1991, "Sign Language Varieties in Costa Rica", in ''Sign Language Studies'' 73, p.329-346 Sign language isolates Sign languages of Costa Rica