Its noun meaning: safety; freedom from worry; something given as pledge of payment, bond or stock certificates; protection.
I loved this picture because of the safety the balloon flower is giving the phlox. The colors are intense, vibrant and beautiful creating a wonderfully exciting palette. The pods in the background I just had to leave in for the interesting shape and bright celadon color. The composition of the photo is dramatic in a way that you wouldn't really expect. I should say that I haven't seen one yet and I look at a lot of books about artists, design and inspiration. Be free, leave your security blanket behind and embrace the unusual!