问无法正确识别的Unicode

EN

for(var i:int=0;i<16;i++) {
  for(var j:int=0;j<16;j++) {
    button = new Button();
    button.x = j*35+10;
    button.y = i*20+10;
    button.height = 21;
    button.width = 35;
    button.setStyle("borderColor","red");
    button.setStyle(" fontWeight","bold");
    button.label= String.fromCharCode(0x2190+16*i+j);
    button.addEventListener(MouseEvent.CLICK,greekalpha_clickHandler);
    vgr.addElement(button);
  }
}