The man page of
nm here: MAN NM says that
The symbol type. At least the following types are used; others are, as well, depending on the object file format. If lowercase, the symbol is usually local; if uppercase, the symbol is global (external)
And underneath it has "b" and "B" for "uninitialized data section (known as BSS)" and "d" and "D" for "initialized data section"
But I thought local variables always goto Stack/Heap and not to "Data" or "BSS" sections. Then what local variables is nm talking about?