Yup, it's the Phoenician letter taw that represents X.

As Nigel Jackson explains: “One of the oldest symbols in the esoteric tradition is the serpent on the tree (by definition a ‘palladium’ representing the Genesis serpent Azazel [See Genesis 3:1]. That a tree may be employed as a symbol of a cross is evidenced by Galations 3:13). This is usually depicted as a snake coiled or crucified on a Tau cross.” – p.183 The Pillars of Tubal Cain. The signification of the Greek letter ‘T’ and the Hebrew ‘t’ as noted by J.F.C. Fuller in his table of Hebrew Alphabet and Correspondences as set forth in his book, The Secret Wisdom of Qabalah [1937 A.D.], is the serpent). The Process Church even had rings made with this cross depicted in red on a white background [within the ‘disk’] the sigil of Azazel [See below]): In Egyptian hieroglyphics the god Ptah (a god who represented Azazel) is always associated with an ‘x’ within a circle, also known as the quartered circle (for this reason an ox has become an esoteric symbol of Azazel.

A male ox is called a bull, a common angel symbol (by extension, Azazel’s human wife may be symbolized as a cow. The Egyptian cow goddess represents Azazel’s human wife). Compare the ‘x’ within a circle symbol of Ptah to the Cross of Wodan, also a cross within a circle. The Germanic god Wodan is yet another god who represented the angel Azazel/Behemoth. The Celtic cross of the Druids also incorporates the ‘cross within a circle’ motif. In some circles the ‘cross within a circle’ motif is known as the Mark of Cain (this is due to the fact that in the Phoenician alphabet the letter ‘T’ is rendered as an ‘X’ and is pronounced ‘tau,’ meaning ‘mark’; the Mark of Cain is also known as the Mark of Set, who is Azazel). Cain of course was the son of Azazel by Eve. The quartered circle was the badge (talisman/magic charm) of the Grand Master of the Knights Templars as well. No doubt it was worn in part to protect the user in battle, as God was said in Genesis 4:15 to have placed such a “mark” upon Cain to keep him from being slain, hence the term, the Mark of Cain).

The so-called Freemasonic Scottish Rite 18th Degree Rose Croix quartered circle (also a symbol of the Gnostics/Gnosticism) is a variant of the ‘cross within a circle’ motif due to the fact the ‘quartered circle’ is variously known as the Rose Cross (See p.94 Dictionary of Occult, Hermetic and Alchemical Sigils by Fred Gettings). The NATO military alliance also employs a variant of the ‘quartered circle’ logo which is representive of the god of war Azazel. And as we learn from the Wicca witch priestess Doreen Valiente in Witchcraft for Tomorrow pp.67-68, the cross within the circle motif, the sign of Azazel, was one of the designs of the ‘magic circles’ of the witches—the construction of such a ‘magic circle’ was standard practice when witch’s invoked their Horned God, who is Azazel. In fact, the device known as the ‘witches’ mark’ which was employed by the witches (often signed during witches’ initiation ceremonies much like when the Catholic Church similiarly makes the sign of the cross) is itself “an X-shaped cross” (Ibid p.179), the sign of Azazel. This is greatly akin 1043 to the ‘Qabalistic Cross’ signed by touching the forehead, then the solar plexus, the right shoulder then the left shoulder, performed during ceremonial magic rituals as well (See p.51 The Practice of Ritual Magic by Gareth Knight).

https://www.bitchute.com/video/1mTCPJotlQX9/