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Here is a test file in /tmp.
debian@debian:~$ xxd /tmp/test
0000000: 0000 6920 616d 2068 6572 650a 7765 2061 ..i am here.we a
0000010: 7265 2068 6572 650a re here.
debian@debian:~$ nano /tmp/test
^@^@i am here
we are here
0000 is ^@^@?? in ascii table ,94 is ^, 64 is @.
^@ is just nano’s way of displaying 0 binary, which is not a displayable ascii character.