'Twin' in the Bible

Then Thomas, who was called Didymus (the twin), said to his fellow disciples, “Let us go too, that we may die with Him.”

But Thomas, one of the twelve [disciples], who was called Didymus (the twin), was not with them when Jesus came.

Simon Peter, and Thomas who is called Didymus (the twin), and Nathanael from Cana of Galilee, as well as [John and James] the sons of Zebedee, and two others of His disciples were together.

At the end of three months we set sail on a ship which had wintered at the island, an Alexandrian ship with the Twin Brothers [Castor and Pollux] as its figurehead.