THE SIGN (of the cross)

This is a quote from the article at the first link below. “The final letter in ancient Hebrew is Tav which in Hebrew means a sign. In modern Hebrew Tav is written ת , but the ancient Hebrew letter for Tav is . (See the second link below.) Is it a coincidence that the symbol for God’s sign is the cross? I believe it is important to remember that this ancient symbol of the cross is not a Gentile symbol. The cross is a Jewish symbol that means ‘the sign’.”