'Denoting' in the Bible

Isaiah said, “This will be the sign to you from the Lord, that He will do the thing that He has spoken: shall the shadow [indicating the time of day] go forward ten steps, or go backward ten steps?”

Listen carefully, I will turn the shadow on the stairway [denoting the time of day] ten steps backward, the shadow on the stairway (sundial) of Ahaz.” And the sunlight went ten steps backward on the stairway where it had [previously] gone down.