Symbol Arm Bone Metal Sign

About the Arm Bone design

One stroke of even thickness traces the whole bone and never fills it in, so the shaft reads as two parallel rails running most of the height. The knobs at top and bottom each swell into twin lobes with a shallow dip notched between them, and the lower pair closes off into a neat rounded pocket. The top breaks that symmetry: the left rail climbs past the joint and stops in a blunt rounded tip, so the upper hollow wraps around a stub that goes nowhere.