eyemark
/ˈʌɪmɑːk/noun
1Something to be seen or noted visually; an object to look at; something which may serve as a mark to guide the eye. In later use also: a visually distinctive feature.
2A marking on an animal around the eye or resembling an eye.
Origin
Late 16th century; earliest use found in Robert Southwell (1561–1595), writer, Jesuit, and martyr. From eye + mark.