BonePatrol

This would work well as the Patrol BTN, although it doesn't look like bones. Perhaps segmenting the tail of the arrow? (like tail bones)

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It's actually 2 ribs with 2 scapula, or at least its supposed to be. Each of the buttons have bones based on actual bones. The rib bones in this icon are the same ones I used in the Cancel button (which have a Clavicle crossing them).