list symbols from object files
-C
--demangle[=style]
    Decode (demangle) low-level symbol names into user-level names.  Besides removing any initial
    underscore prepended by the system, this makes C++ function names readable. Different compilers have
    different mangling styles. The optional demangling style argument can be used to choose an
    appropriate demangling style for your compiler.
source manpages: avr-nm