What's Your Favorite Amazon Kindle Short Cut?

I did have a chance to post a few simple Kindle shortcuts a while back. I promised that I would write about some more advanced shortcuts, and I guess I’ll have to keep that promise. But before we get to that, I was wondering if you have any favorite shortcut on Kindle. Mine is the time shortcut. I really lose track of time when I am reading, and it helps a lot to have the option to know what time it is without getting out of bed.