So the text at that point literally talks about ‘many-eyes seraphims’. The eyes symbol is a pure gag—seems to be spliced in place of the letter ‘о’ in the word ‘eye’ just a little down the line. (However, Old Slavonic is a tough read due to no spaces, so I'm not sure about that word. But at least it's not the Glagolitic script, which was just ridiculous and actually had multi-circle letters.)
