ca is the ISO 639 language code for Catalan; Valencian.
Standard
ISO 639-1
Code
ca
Language
Catalan; Valencian
ISO 639-2
cat
About this code
ca is the code for Catalan; Valencian under ISO 639, the standard used to tag languages in web pages, software locales and library records. Its three-letter ISO 639-2 form is cat.