Old Testament Hebrew Lexical Dictionary
Strong's #8420 - תָּו
Jeff Brenner, Ancient Hebrew Research Center Used by permission of the author.
תָּו m. (for תָּוֶה, from the root תָּוָה No. I)
(1) a sign, Ezekiel 9:4. (Arab. تِوَى, تِوَاءُ a sign in the form of a cross branded on the thigh or neck of horses and camels, whence the name of the letter ת, which in Phœnician, and on the coins of the Maccabees has the form of a cross. From the Phœnicians the Greeks and Romans took both the name and form of the letter.)
(2) sign (cruciform), mark subscribed instead of a name to a bill of complaint; hence subscription, Job 31:35. It is stated that at the Synod of Chalcedon and other synods principally in the East, some even of the bishops being unable to write, put the sign of the cross instead of their names, which is still often done by common people in legal proceedings; so that in the infancy of the art of writing this could not fail of being the case, so as for the expression to be received into the usage of language.
the Third Week after Easter