In OLE Automation, an identifier that a class exposes to other applications. Automation clients use the external name to request an object of this class from an automation server. In C/C++, an identifier declared with global scope or declared using the extern storage class.
The name of an object referenced by a program unit, as it appears to the linker. Case is not significant in the names that appear in Fortran source files; but it is significant in external names.
a name of a subroutine, function, block data subprogram, or labeled common