What is the difference between "Local Linker Symbols" & "Local Program Variables"?

Question

I want to know the difference between "Local Linker Symbols" & "Local Program Variables"?

I'm reading a book which has this:

What does each mean? Any examples?

Answer 1

/* This function has global scope within this file (module). It is represented 
 * by a "local linker symbol", since the linker will need to resolve its address 
 * if it is referenced by any other function.
 */
static void some_function()
{
    /* These "local program variables" are of no interest to the linker 
     * since they are not visible outside the current function, so no other 
     * part of the program can possibly reference them.
     */
    int a, b, c;
}