# International Components for Unicode C API

Category | Keyword | API Naming Convention
UChar, Unicode and Message Formatting | u | u_<function name>
UResourceBundle | ures | ures_<function name>
ULocale | uloc | uloc_<function name>
UConverter | ucnv | ucnv_<function name>
UCollator | ucol | ucol_<function name>
UNumberFormat | unum | unum_<function name>
UDateFormat | udat | udat_<function name>
UCalendar | ucal | ucal_<function name>
UBreakIterator | ubrk | ubrk_<function name>
Constants |  | u<keyword>_<constant name>
Acquiring an International Service |  | u<keyword>_open u<keyword>_openRules
Releasing the Acquired International Service |  | u<keyword>_close
Methods |  | u<keyword>_<method name>