'Signature' in the Bible

If only I had someone to hear my case!Here is my signature; let the Almighty answer me.Let my Opponent compose His indictment.

serve as His sign to all mankind,so that all men may know His work.

This greeting is written with my own signature "Paul." Remember that I remain imprisoned. May grace be with you! Amen.

I, Paul, write you this final greeting with my own hand. This is the distinguishing mark in every letter [of mine, that shows it is genuine]. It is the way I write [my handwriting and signature].