'Sign' in the Bible

But he came to an end, and there was no sign of him; I made a search for him and he was not there.

Our name is a word of shame among the nations, a sign for the shaking of heads among the peoples.

I have become an ominous sign to many,but You are my strong refuge.

Show me a sign of Your goodness;my enemies will see and be put to shamebecause You, Lord, have helped and comforted me.

He made the moon for a sign of the divisions of the year; teaching the sun the time of its going down.