'Symbols' in the Bible

You should tie them as a reminder on your forearm and fasten them as symbols on your forehead.

But this is how you shall deal with them: you shall tear down their altars and smash to pieces their sacred pillars, and cut down their Asherim (symbols of the goddess Asherah), and burn their carved or sculpted images in the fire.

Fix these words of mine into your mind and being, and tie them as a reminder on your hands and let them be symbols on your forehead.