What does 2 Kings 20:9 mean?

And Isaiah said, This shall be the sign unto thee from Jehovah, that Jehovah will do the thing that he hath spoken: shall the shadow go forward ten steps, or go back ten steps?

And Isaiah said, This sign shalt thou have of the Lord, that the Lord will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees?

And Isaiah said, This shall be the sign unto thee from Jehovah, that Jehovah will do the thing that he hath spoken: shall the shadow go forward ten steps, or go back ten steps?

And Isaiah said, This is the sign the Lord will give you, that he will do what he has said; will the shade go forward ten degrees or back?

And Isaiah saith, `This <FI>is<Fi> to thee the sign from Jehovah, that Jehovah doth the thing that He hath spoken--The shadow hath gone on ten degrees, or it doth turn back ten degrees?'

And Isaias said to him: This shall be the sign from the Lord, that the Lord will do the word which he hath spoken: Wilt thou that the shadow go forward ten lines, or that it go back so many degrees?

And Isaiah said, This [shall be] the sign to thee from Jehovah, that Jehovah will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees?