Yes. That is the Ancient of Days. A non-canonical icon if I have ever seen one. Why do some iconostasi, especially the Russian Baroque and 19th c. style ones, have the triangular eye symbol?
This is how I have heard it:
"The Eye of Providence" (also known as the All-seeing Eye) is a symbol that exists in many cultures around the world. The oldest usage of the symbol appearently dates back to ancient Egypt. In Western iconography, an eye, enclosed by a triangle, have historically been used as a symbol of the Trinity. During the 18th and 19th century, the symbol, together with many other aspects of western art and iconography, was introduced to the Orthodox Church.
The eye in the triangle may have come into use in Orthodox lands, but it is unacceptable in iconographic terms.
I've always been uncomfortable with it. I try and comfort myself with the words "all-seeing eye" which come up in the priest's prayer at the bowing of heads at the end of the Orthros (and, of course, the accompanying prayer), but it is of little use.
"O Cross of Christ, all-holy, thrice-blessed, and life-giving, instrument of the mystical rites of Zion, the holy Altar for the service of our Great Archpriest, the blessing - the weapon - the strength of priests, our pride, our consolation, the light in our hearts, our mind, and our steps"
Met. Meletios of Nikopolis & Preveza, from his ordination.