Tristropha Neume

The image features a single musical notation mark known as a tristropha, rendered in black ink against a plain white background. The mark consists of three nearly identical, thick, slightly curved vertical dashes or commas placed in a row. These shapes are characteristic of medieval Gregorian chant notation, used to indicate the repetition of a single pitch.

This neume is a fundamental component of Western medieval music notation, used in Gregorian chant to indicate a repeated note, typically performed as a vibrato or tremor. It is central to the development of plainsong notation in monastic traditions.