The "A" glyoh is a cow's head. The original drawing got obsolete a few millennia ago, but the drawing had acquired it's own meaning since. Maybe in a few more

The "A" glyoh is a cow's head. The original drawing got obsolete a few millennia ago, but the drawing had acquired it's own meaning since. Maybe in a few more millennia a square with a smaller rectangle will represent the "S" sound in some future language.