The Multiocular O

The manuscript page where the many-eyed O of Episode 9 appears

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the ꙮ, an O of many eyes

The word is «серафими многоꙮчитїи» — “many-eyed seraphim” — on folio 243v of the Buslaev Psalter.

Count the eyes. There are ten.

Detail of a medieval Cyrillic manuscript page showing the word for many-eyed seraphim, in which the letter O is drawn with ten small eyes inside it
Detail of a medieval Cyrillic manuscript page showing the word for many-eyed seraphim, in which the letter O is drawn with ten small eyes inside it

Public domain · anonymous scribe, 15th century · Wikimedia Commons