A Dumb Question!

[Alexicography]

I've been seeing a lot of people with numbers in their signatures, like this one I copy-pasted:

1.0.0 Leopard Gecko
1.1.1 Hermit Crabs
1.0.0 Rhodesian Ridgeback
1.0.0 Rabbit
1.0.0 Pit Bull
0.1.0 English Bulldog

What do they mean? I mean I get that it's a list of pets, but I don't understand the "1.0.0", "0.1.0", or "1.1.1" code. I see it on a number of signatures and I Do Not Get It.

 

[Aimless]

male.female.unsexed

so 0.1.0 dogs is one female dog; 1.0.0 leos is one male leo.

 

[Alexicography]

Ohhhhh okay that makes sense! Thanks!