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, it is one of the sources of
New Costa Rican Sign Language. (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