Signatures?

I see people listing their pets with numbers by it such as

0.1.0
1.0.0

etc. can I ask what the numbers stand for? I'd like to set up my signature with my animals :) Thanks.

Male . Female . Unkown Sex

so a 1.1 is
1 male and 1 female

1.0 is one male and no females

Ah got it, thanks :)