private void initCrossHairs() {
    setDisplayStatView(false);
    guiFont = assetManager.loadFont("Interface/Fonts/Default.fnt");
    BitmapText ch = new BitmapText(guiFont);
    ch.setSize(guiFont.getCharSet().getRenderedSize() * 2);
    ch.setText("+"); // crosshairs
    ch.setLocalTranslation( // center
      settings.getWidth() / 2 - ch.getLineWidth()/2, settings.getHeight() / 2 + ch.getLineHeight()/2, 0);
    guiNode.attachChild(ch);
  }
A centred plus sign to help the player aim.
jme3-examples/src/main/java/jme3test/helloworld/HelloPicking.java