Trivirga

A simple black-and-white digital graphic consisting of three short, thick, parallel diagonal bars arranged side-by-side. The lines are uniform in thickness and tilt at an identical angle, creating a rhythmic visual sequence. This pattern is characteristic of early musical notation found in medieval liturgical manuscripts.

The 'trivirga' is a neume used in Gregorian chant manuscripts to indicate the pitch and melodic inflection of three consecutive notes at the same or similar pitch level. It represents the historical transition from oral mnemonic tradition to the graphic notation of Western sacred music.