Yes, it's 4 binary bytes in octal notation. Can read it as 8 * first digit + second digit. the leading \n is a newline character, which is ASCII 10 (octal 12).
use Data::Dump qw(dump);
print dump( pack("c*", 10, 3, 30, 21 ) ); # outputs: "\n\3\36\25"
Okay, that "\n" isn't octal notation obviously, it's the Perl string escape code.
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