An element with 6 protons and 6 or 8 neutrons

Also a set of APIs for MacOSX. Programs written for Carbon can also run on MacOS 9 or 8.6 with a library called CarbonLib. Earlier versions of CarbonLib also run on PowerPC computers running MacOS 8.1. Carbon consists of the ~75% of the API calls of MacOS Classic (which accounted for ~95% of what programs used). The API calls that wouldn't work with ProtectedMemory or PreemptiveMultitasking were removed. Carbon applications are usually written in C or C++.

See also Cocoa.