The Sign, The Covenant Seal, The END From Protection To Prophecy

Tav: Covenantal & Prophetic
Tav (or "Taw" in ancient pronunciations).
Tav has a numerical value: 400.
Hebrew letters also have numerical value—this which makes Tav the largest single-letter value.

In ancient Paleo-Hebrew, the original pictographic form of Tav resembled an "X" or cross mark (✖️), which means, "mark, sign, covenant, seal, completion, or end.
This gives Tav a prophetic and covenantal symbolism.

Biblical Significance:
According to Ezekiel 9:4, 6 KJV, "And the MOST HIGH YAH said unto him, Go through the midst of the city, through the midst of Jerusalem, and set a MARK upon the foreheads of the men that sigh and that cry for all the abominations that be done in the midst thereof.
[6] slay utterly old and young, both maids, and little children, and women: but come not near any man upon whom is the MARK; and begin at my sanctuary. Then they began at the ancient men which were before the house."

In Hebrew, the word was used for a "MARK" is "Tav", symbolizing divine protection.

According to Jeremiah 51:9 KJV, "We would have healed BABYLON, but she is NOT HEALED: FORSAKE HER, and let us GO EVERY ONE into his OWN COUNTRY: for HER JUDGMENT REACHETH unto HEAVEN, and is LIFTED UP EVEN to the SKIES."

Also, according to Revelation 18:10 KJV, "Standing afar off for the fear of her torment, saying, Alas, alas, that great city BABYLON, that MIGHTY CITY! for in ONE HOUR is THY JUDGMENT COME.

Lastly, Revelation 18:2 KJV, "And he cried mightily with a strong voice, saying, BABYLON the GREAT is FALLEN, is FALLEN, and is become the HABITATION OF DEVILS, and the hold of every foul spirit, and a cage of every unclean and hateful bird."