'Sign' in the Bible

Meanwhile, Gehazi went on ahead of them and placed the staff on the youngster's face, but when there was no sound or reaction, he returned, met Elisha, and told him, "The youngster has shown no sign of awakening."

"This will serve as a sign for you: you'll eat this year from what grows by itself, in the second year what grows from that, and in the third year you'll sow, reap, plant vineyards, and enjoy their fruit.

Now Hezekiah had asked Isaiah, "What is to be the sign that the LORD is healing me and that I'll be going up to the LORD's Temple three days from now?"

So Isaiah replied, "This will be your sign from the LORD that the LORD will do what he has promised. Shall the shadow go forward ten steps or go back ten steps?"