What does "__FD_PRN_" means in perl code ?

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# 1  
Error What does "__FD_PRN_" means in perl code ?

I have seen something like this in a perl code:

$_ =~ s/__FD_PRN_/\\(/g

What does this "__FD_PRN_" means. I have searched google but was not able to find any info regarding this. Appreciate if some one can refer to a link for these characters. From comments/code it used to substitue "(" with "\(".
# 2  
$ ./test.pl 

$ cat test.pl
$test = "ABC__FD_PRN_EFG";
$test =~ s/__FD_PRN_/\\(/g;
print "$test\n";

# 3  
Thanks for reply, but i am really interested in knowing significance of "__FD_PRN_". Is this a ascii or some other representation of "(" ? Could you please let me know what exactly these codes are called and is it specific to perl only?
# 4  
It's nothing special to Perl, just a string it searches for and then replaces. The only thing it's probably specific to is the application that generated the original string.
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