It can be anything that you feel highly relates to you. The goal is for that object to help get your mind back in check when things in your life go out of control. Linus’ (peanuts character) security blanket is a form of an anchor.

Some people choose religious symbols like rosaries or the mudra, but it doesn’t have to be limited to that.

In books, I’ve seen people keep old pictures or small tokens to do just the same thing.