As DigitalKitty says, you can only select one radio button at a time. Therefore, by implication, you are always dealing with groups of buttons. Here is a CGI.pm example, which generates the calling form from perl:

#!/usr/local/bin/perl

use strict;
use CGI qw(:standard);
use CGI::Carp qw(fatalsToBrowser);

print header, start_html, h1("Radio Button Test"), "\n";

print start_form(-method=>'GET'),radio_group(
        -name => 'test',
        -values => ['A','B','C'],
        -linebreak => 'true');
        
print submit(
        -name => 'action',
        -value => 'go'), end_form, end_html, "\n";
[download]

I have used METHOD=GET, so that people running this can see the query string - hence what is being passed in.

Each button has a distinct value, but share a common name.