Cyrillic Small Letter Monocular O

It marks an O in the historical word for “eye.” This Cyrillic O with a dot appears in manuscripts by the 11th century. In southern Slavic writing it also appeared at word beginnings or after vowels; by the late 13th or early 14th century, scribes used it for oko and related eye-root forms.

The dot made the O look like an eye while distinguishing the spelling, not the sound. The convention narrowed to the singular eye-root word and its grammatical forms. By the mid-16th century, these special O forms had disappeared from general use.

Which O variant is this?

One dot marks the singular eye-root form. Related scribal forms used two dots or doubled O for “eyes,” and a many-eyed O for the epithet “many-eyed seraphim.” These were distinct historical spellings within the same family.

Should you send ꙩ as an eye?

Only when the reader expects historical Cyrillic. In a manuscript edition, the dot carries spelling information; in an ordinary message, this is an archaic letter with no established eye-reaction reading.