Well... there is a small legend/myth... a saga if you will..about this.

When we wave to OO, we usually get an icy glare (there are exceptions). One day a CPZ guy was gettin no love from OO on the ramp so he did a double wave like a crazy man, like this https://goo.gl/images/AcxxP7, it became a compass tradition overnight. So this is how we wave to each other and still to OO. We even got it added to the emoji database 🤗🤗🤗🤗. It's how we cope with not being mainline like OO.