Is there only one meaning? It could stand for Magnus!

[ The bird chirps cheerfully, finally drawing a laugh from the man acting as her perch. He nudges her gently, prompting to fly and settle on the arm of the chair he'd offered moments ago. ]

She's a fickle thing, so I'll have the pleasure of telling you. It is a double meaning. The M stands for May, the face of the organization. The W stands for where you would uncover them. It used to be a bird... but I found that they would kill far too many trying to find this place.