What is _gateway in my route table?

I just ran "route" on my laptop's terminal and see this line for the default entry in my route table:

enter image description here

In examples I am seeing in books and online, the default entry includes an actual ip address for the gateway. Why do I not have that and have "_gateway" instead? What does "_gateway" mean? Is it possible to retrieve the actual ip address of the gateway?

Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.