Does Anyone know what G Indexed is?

I went to analytic site(urldogg) just to get some analysis on my website, one of the tracking categories was "G Indexed" which i immediately thought was "google indexed" but when i saw the value of "0" associated with my site i knew that couldnt be, my site is definitely indexed by google, so i have no clue what "G Indexed" is; when i compare competitor sites, they have "G Indexed" of 5,650 or 1020, so im sure it's important im just not sure what it is? Any help would be appreciated.

thanks

Their data is incorrect, thats all.

It could mean how many "google indexed" backlinks the other sites have?