On the left it seems to be a slightly stylized "H" with a vertical line coming down behind the middle of the cross bar of the "H". In other words the H is lying over the vertical line
The one in the middle looks like a head facing left and looking somewhat upwards. The "frame" around this portrait is essentially rectangular with the upper corners above the head clipped diagonally.
The one on the right is a mystery and most likely was poorly struck.